| ReSMA | Reparto Sperimentazioni di Meteorologia Aeronautica | In Italian | → Meteorology, climatology |
| RF | Rivista di Filosofia | In Italian | → Serial publications, periodicals → Philosophy, psychology |
| RFI | Rete Ferroviaria Italiana | In Italian | → Rail transport engineering → Transport and postal services |
| RFIC | Rivista di Filologia e di Instruzione Classica | In Italian | → Serial publications, periodicals → Philology |
| RFNS | Rivista di Filosofia Neoscolastica | In Italian | → Serial publications, periodicals → Philosophy, psychology |
| RIDITT | Rete Italiana per la Diffusione dell'Innovazione e il Trasferimento Tecnologico alle Imprese | In Italian | → Engineering, technology |
| RIG | Rivista Italiana di Geofisica | In Italian | → Serial publications, periodicals → Geophysics |
| RIGSA | Rivista Italiana di Geofisica e Scienze Affini | In Italian | → Serial publications, periodicals → Geophysics |
| RMetA | Rivista di Meteorologia Aeronautica | In Italian | → Serial publications, periodicals → Meteorology, climatology → Aeronautics, aircraft |
| RMN | Risonanza Magnetica Nucleare = RMN | Résonance Magnétique Nucléaire | In French = NMR | Nuclear Magnetic Resonance | In English = RMN | Ressonància Magnètica Nuclear | In Catalan = תמ"ג | תהודה מגנטית גרעינית | In Hebrew = ЯМР | Я́дерного магни́тного резона́нса | In Russian = НМР | Нуклеарна магнетна резонанција | In Serbian |
In Italian | → Medicine → Nuclear, atomic, and molecular physics → 629031 |
| RomCo | Osservatorio Astronomico di Roma su Monte Mario - Contributi Scientifici | In Italian | → Serial publications, periodicals → Astronomy |
| RSF | Rivista critica di Storia della Filosofia | In Italian | → Serial publications, periodicals → Philosophy, psychology → History |
| RSF | Rivista di Storia de la Filosofia | In Italian | → Serial publications, periodicals → Philosophy, psychology |
| RSFil | Rassegna di Scienze Filosofiche | In Italian | → Serial publications, periodicals → Philosophy, psychology |
| RSFJ | Repubblica Socialista Federale di Jugoslavia = СФРЈ | Социјалистичка Федеративна Република Југославија | In Macedonian = SFRY | Socialist Federal Republic of Yugoslavia | In Serbian = SFRJ | Socijalistička Federativna Republika Jugoslavija | In Serbo-Croatian = RFSY | République Fédérale Socialiste de Yougoslavie | In French = JEFS | Jugoslaviako Errepublika Federal Sozialista | In Basque = RFSY | República Federal Socialista de Yugoslavia | In Spanish = SFRJ | Sozialistische Föderative Republik Jugoslawien | In German = SFRJ | Socialistická federativní republika Jugoslávie | In Czech = RFSI | República Federal Socialista de Iugoslàvia | In Catalan = SFRJ | Socjalistyczna Federacyjna Republika Jugosławii | In Polish = RSFJ | República Socialista Federal da Iugoslávia | In Portuguese = RSFI | Republica Socialistă Federativă Iugoslavia | In Romanian = СФРЮ | Социалистическая Федеративная Республика Югославия | In Russian = SFRJ | Socialistična federativna republika Jugoslavija | In Slovenian |
In Italian | → Geography → History |
| RSO | Rivista degli Studi Orientali | In Italian | |
| RSS | Repubbliche Socialiste Sovietiche = PSR | Padomju Sociālistiskajām Republikām | In Latvian = RSS | Republici Sovietice Socialiste | In Romanian = SSR | Sovjetskih Socialističnih Republik | In Slovenian = RSS | Républiques Socialistes Soviétiques | In French |
In Italian | → Politics → Geography |
| RSS | Rassegna Storica Salernitana | In Italian | → Serial publications, periodicals |
| RTM | Reggio Terzo Mondo | In Italian | → Organizations and associations |
| RvTS | Rivista Tecnica Selenia | In Italian | → Serial publications, periodicals → Telecommunications |
| S | Zolfo = S | Soufre | In French = S | Swawel | In Afrikaans = S | كبريت | In Arabic = S | Azufre | In Asturian = S | Kükürd | In Azerbaijani = S | Сера | In Belarusian = S | Сяра | In Bulgarian = S | গন্ধক | In Bengali = S | Sumpor | In Bosnian = S | Sofre | In Catalan = S | Zolfu | In Corsican = S | Síra | In Czech = S | Sylffwr | In Welsh = S | Svovl | In Danish = S | Schwefel | In German = S | Θείο | In Greek = S | Sulfur | In English = S | Sulfuro | In Esperanto = S | Azufre | In Spanish = S | Väävel | In Estonian = S | Sufre | In Basque = S | گوگرد | In Persian = S | Rikki | In Finnish = S | Solfar | In Friulian = S | Xofre | In Galician = S | גופרית | In Hebrew = S | गन्धक | In Hindi = S | Sumpor | In Croatian = S | Souf | HT = S | Kén | In Hungarian = S | Ծծումբ | In Armenian = S | Belerang | In Indonesian = S | Sulfo | In Ido = S | Brennisteinn | In Icelandic = S | 硫黄 | In Japanese = S | 황 | In Korean = S | Kibrît | In Kurdish = S | Schwiefel | In Letzeburgesh = S | Solfer | LI = S | Siera | In Lithuanian = S | Sērs | In Latvian = S | Pungatara | In Māori = S | Сулфур | In Macedonian = S | ഗന്ധകം | In Malayalam = S | Хүхэр | In Mongolian = S | सल्फर | MR = S | Swevel | NDS = S | Zwavel | In Dutch = S | Svovel | In Nynorsk = S | Svovel | In Norwegian = S | Sulfre | NOV = S | Sofre | In Occitan = S | Siarka | In Polish = S | Enxofre | In Portuguese = S | Salina | In Quechua = S | Sulf | In Romanian = S | Сера | In Russian = S | Surfi | In Sicilian = S | Sumpor | In Serbo-Croatian = S | Síra | In Slovak = S | Žveplo | In Slovenian = S | Squfuri | SQ = S | Сумпор | In Serbian = S | Walirang | SU = S | Svavel | In Swedish = S | Sulfuri | In Swahili = S | கந்தகம் | In Tamil = S | గంధకము | TE = S | กำมะถัน | In Thai = S | Kükürt | In Turkish = S | Сірка | In Ukrainian = S | Oltingugurt | In Uzbek = S | Lưu huỳnh | In Vietnamese = S | שװעבל | In Yiddisch = S | 硫 | In Chinese |
In Italian | → Chemistry |
| S | Serina = S | Serine | In English = S | سيرين | In Arabic = S | Serina | In Catalan = S | Serin | In Czech = S | Serin | In Danish = S | Serin | In German = S | Serina | In Spanish = S | Serino | In Esperanto = S | Sérine | In French = S | 세린 | In Korean = S | Serin | In Croatian = S | Serin | In Indonesian = S | סרין | In Hebrew = S | Serīns | In Latvian = S | Serin | In Letzeburgesh = S | Serinas | In Lithuanian = S | Serine | In Dutch = S | セリン | In Japanese = S | Serin | In Norwegian = S | Seryna | In Polish = S | Serina | In Portuguese = S | Серин | In Russian = S | Seriini | In Finnish = S | Serin | In Swedish = S | செர்ரீன் | In Tamil = S | Serin | In Turkish = S | Серин | In Ukrainian = S | 絲氨酸 | In Chinese |
In Italian | → Biochemistry, biophysics |
| SACT | Scrittori Associati di Cinema e Televisione Italiani (www.sact.it) | In Italian | → Organizations and associations → Cinema, movies → Telecommunications |
| SAI | Sindacato Attori Italiano | In Italian | → Organizations and associations → Cinema, movies |
| SANAS | Sindacato Autonomo Nazionale Arte e Spettacolo | In Italian | → Organizations and associations → Entertainment |
| SBN | Servizio Bibliotecario Nazionale | In Italian | → Libraries |
| SCAIP | Servizio Collaborazione Assistenza Internazionale Piamartino | In Italian | → Organizations and associations |
| SCI | Servizio Civile Internazionale | In Italian | → Organizations and associations |
| SCO | Studi Classica e Orientali | In Italian | → Serial publications, periodicals → Language, linguistics, literature → Geography, biography, history |
| SCSF | Solidarietà e Cooperazione Senza Frontiere | In Italian | → Organizations and associations |
| SDI | Socialisti Democratici Italiani (www.sdionline.it) | In Italian | → Political parties and movements |
| SDSI | Societá Degli Storici Italiani | In Italian | → Organizations and associations → History |
| Se | Selenio = Se | Sélénium | In French = Se | Selenium | In Afrikaans = Se | سيلينيوم | In Arabic = Se | Селен | In Belarusian = Se | Селен | In Bulgarian = Se | সেলেনিয়াম | In Bengali = Se | Selen | In Bosnian = Se | Seleni | In Catalan = Se | Seleniu | In Corsican = Se | Selen | In Czech = Se | Selen | In Danish = Se | Selen | In German = Se | Σελήνιο | In Greek = Se | Selenium | In English = Se | Seleno | In Esperanto = Se | Selenio | In Spanish = Se | Seleen | In Estonian = Se | سلنیوم | In Persian = Se | Seleeni | In Finnish = Se | Seleni | In Friulian = Se | Selenio | In Galician = Se | סלניום | In Hebrew = Se | सेलेनियम | In Hindi = Se | Selenij | In Croatian = Se | Selenyòm | HT = Se | Szelén | In Hungarian = Se | Սելեն | In Armenian = Se | Selenium | In Indonesian = Se | Selenio | In Ido = Se | Selen | In Icelandic = Se | セレン | In Japanese = Se | lurcmu | JBO = Se | 셀레늄 | In Korean = Se | Selenium | In Latin = Se | Selen | In Letzeburgesh = Se | Selenas | In Lithuanian = Se | Selēns | In Latvian = Se | Селен | In Macedonian = Se | सेलेनियम | MR = Se | Selen | NDS = Se | Seleen | In Dutch = Se | Selen | In Nynorsk = Se | Selen | In Norwegian = Se | Selèni | In Occitan = Se | Selen | In Polish = Se | Selênio | In Portuguese = Se | Silinyu | In Quechua = Se | Seleniu | In Romanian = Se | Селен | In Russian = Se | Sileniu | In Sicilian = Se | Selen | In Serbo-Croatian = Se | Selén | In Serbian = Se | Selen | In Slovenian = Se | Селен | In Serbian = Se | Selen | In Swedish = Se | Seleni | In Swahili = Se | செலீனியம் | In Tamil = Se | ซีลีเนียม | In Thai = Se | Selenyum | In Turkish = Se | Селен | In Ukrainian = Se | Selen | In Uzbek = Se | 硒 | In Chinese |
In Italian | → Chemistry |
| SEBC | Sistema Europeo delle Banche Centrali = SEBC | Système Européen de Banques Centrales | In French = ESCB | Europski sistem centralnih banaka | In Bosnian = SEBC | Sistema Europeu de Bancs Centrals | In Catalan = ESCB | Det Europæiske System af Centralbanker | In Danish = ESZB | Europäisches System der Zentralbanken | In German = ΕΣΚΤ | Ευρωπαϊκό Σύστημα Κεντρικών Τραπεζών | In Greek = ESCB | European System of Central Banks | In English = ESCB | Eŭropa Sistemo de Centraj Bankoj | In Esperanto = SEBC | Sistema Europeo de Bancos Centrales | In Spanish = EKPS | Euroopa Keskpankade Süsteemi | In Estonian = KBER | Központi Bankok Európai Rendszere | In Hungarian = ESCB | Europees Stelsel van Centrale Banken | In Dutch = ESSB | Det europeiske systemet av sentralbanker | In Norwegian = ESBC | Europejski System Banków Centralnych | In Polish = SEBC | Sistema Europeu de Bancos Centrais | In Portuguese = ЄСЦБ | Європейська система центральних банків | In Ukrainian = ESCB | Európsky systém centrálnych bánk | In Slovak = ECBS | Europeiska centralbankssystemet | In Swedish |
In Italian | → Banks → European Union |
| SEE | Spazio Economico Europeo = EEA | European Economic Area | In English = EEE | Espace Économique Européen | In French = EWR | Europäischer Wirtschaftsraum | In German = ЕИЗ | Европейска икономическа зона | In Bulgarian = EHP | Evropský hospodářský prostor | In Czech = EØS | Europæisk Økonomisk Samarbejdsområde | In Danish = EEA | Eŭropa Ekonomia Areo | In Esperanto = ΕΟΖ | Ευρωπαϊκή Οικονομική Ζώνη | In Greek = EES | Evrópska efnahagssvæðið | In Icelandic = EES | Europeiska Ekonomiska Samarbetsområdet | In Swedish = EWR | Europäesche Wirtschaftsraum | In Letzeburgesh = EGT | Európai Gazdasági Térség | In Hungarian = EER | Europese Economische Ruimte | In Dutch = EEA | 欧州経済領域 | In Japanese = EØS | Det europeiske økonomiske samarbeidsområde | In Norwegian = EØS | Det Europeiske Økonomiske Samarbeidsområdet | In Nynorsk = EOG | Europejski Obszar Gospodarczy | In Polish = EEE | Espaço Económico Europeu | In Portuguese = ЕЭЗ | Европейская экономическая зона | In Russian = EHP | Európsky hospodársky priestor | In Slovak = ЕЕП | Европски економски простор | In Serbian = ETA | Euroopan talousalue | In Finnish |
In Italian | → Economics → European Union |
| SeS | Salute e Sviluppo | In Italian | → Organizations and associations |
| SFOP | Strumento Finanziario di Orientamento della Pesca = IFOP | Instrument Financier d'Orientation de la Pêche | In French = FIAF | Finanzinstrument für die Ausrichtung der Fischerei | In German = FIFG | Financial Instrument for Fisheries Guidance | In English = FFU | Fonden för Fiskets Utveckling | In Swedish |
In Italian | → Finance → European Union → Fishing, hunting |
| SGI | Società Geologica Italiana | In Italian | → Organizations and associations → Earth sciences |
| SIA | Società Italiana di Andrologia | In Italian | → Organizations and associations → Sexual problems → Urology |
| SIAE | Società Italiana degli Autori ed Editori (www.siae.it) | In Italian | → Organizations and associations |
| SICI | Società Italiana di Citologia | In Italian | → Organizations and associations → Cytology |
| SICI | Sistema Informativo Catastrofi Idrogeologiche | In Italian | → Earth sciences |
| SIFC | Società Italiana per lo Studio della Fibrosi Cistica | In Italian | → Organizations and associations → Pathology |
| SIG | Sistema Informativo Geografico = GIS | Geographic(al) Information System | In English = SIG | Sistema de Información Geográfica | In Spanish = SIG | Sistema d'informació geogràfica | In Catalan = GIS | Geografický Informační Systém | In Czech = ГИС | Географска информационна система | In Bulgarian = ΓΣΠ | Γεωγραφικά Συστήματα Πληροφοριών | In Greek = GIS | Geographisches Informationssystem | In German = GIS | Geoinformationssystem | In German = GIS | Geoinfosüsteem | In Estonian = GIS | Geografski informacijski sustav | In Croatian = ממ"ג | מערכת מידע גאוגרפית | In Hebrew = GIS | Geografinė informacinė sistema | In Lithuanian = SIG | Sistem Informasi Geografis | In Indonesian = GIS | Geografisch Informatiesysteem | In Dutch = GIS | Geografiske informasjonssystem | In Nynorsk = GIS | Geografiske informasjonssystemer | In Norwegian = SIG | Sistema de informação geográfica | In Portuguese = ГИС | Географическая Информационная Система | In Russian = GIS | Geografski informacijski sistem | In Slovenian = GIS | Geografiskt InformationsSystem | In Swedish = ГІС | Геоінформаційна система | In Ukrainian |
In Italian | → Software → Geography |
| SIP | Società Idroelettrica Piemontese | In Italian | → Energy economics → Electrical engineering |
| SIT | Sistema Informativo Territoriale = SIT | Système d'Information sur le Territoire | In French = SIT | System Informacji o Terenie | In Polish |
In Italian | → Software → Regional planning → Geography |
| SNAD | Sindacato Nazionale Autori Drammatici (www.csc-cinematografia.it) | In Italian | → Organizations and associations → Language, linguistics, literature |
| SNAG | Sindacato Nazionale Autonomo Giornalai | In Italian | → Organizations and associations → 70 |
| SNCCI | Sindacato Nazionale Critici Cinematografici Italiani (www.sncci.it) | In Italian | → Organizations and associations → Cinema, movies |
| SNGCI | Sindacato Nazionale Giornalisti Cinematografici Italiani (www.cinegiornalisti.it) | In Italian | → Organizations and associations → Newspapers, journalism → Cinema, movies |
| SpA | Società per Azioni = AB | Akcinė bendrovė | In Lithuanian = AK | Akcia Kompanio | In Esperanto = AT | Акцыянэрнае таварыства | In Bulgarian = AS | Aktsiaselts | In Estonian = AG | Aktiengesellschaft | In German = DD | Dioničko Društvo | In Croatian = AS | Aksjeselskap | In Norwegian = AS | Aktieselskab | In Danish = SA | Spółka Akcyjna | In Polish = SA | Societăţi pe Acţiuni | In Romanian = AB | Aktiebolag | In Swedish = AD | Akcionarsko Društvo | In Serbian = DD | Delniška Družba | In Slovenian = AS | Akciová Spoločnosť | In Slovak = AS | Akciová Společnost | In Czech = AT | Акціонерне товариство | In Ukrainian |
In Italian | → Economics |
| SPI | Società Paleontologica Italiana | In Italian | → Organizations and associations → Palaeontology |
| SSII | Società Svizzera per l'Informatica nell'Insegnamento = SVIA | Schweizerischer Verein für Informatik in der Ausbildung | In German = SSIE | Société Suisse pour l'Informatique dans l'Enseignement | In French |
In Italian | → Organizations and associations → Computer science → Education |
| SSISS | Società Svizzera degli Insegnanti delle Scuole Secondarie = VSG | Verein schweizerischer Gymnasialehrerinnen und Gymnasiallehrer | In German = SSPES | Societé Suisse des Professeurs de l'Enseignement Secondaire | In French |
In Italian | → Organizations and associations → Education → Sport, physical exercises |
| SSV | Societè Svizzeradi Vessillologia (www.vexilologia.org) | In Italian | → Organizations and associations → 9299 |
| SUCOS | Solidarietà Uomo Cooperazione Sviluppo | In Italian | → Organizations and associations → Development |
| SVI | Servizio Volontario Internazionale | In Italian | → Organizations and associations |
| T | Treonina = T | Threonine | In English = T | Treonina | In Catalan = T | Threonin | In Czech = T | Threonin | In German = T | Treonina | In Spanish = T | Treonino | In Esperanto = T | Thréonine | In French = T | 트레오닌 | In Korean = T | Treonin | In Indonesian = T | תראונין | In Hebrew = T | Treonīns | In Latvian = T | Threonin | In Letzeburgesh = T | Treoninas | In Lithuanian = T | Threonine | In Dutch = T | トレオニン | In Japanese = T | Treonina | In Polish = T | Treonina | In Portuguese = T | Треонин | In Russian = T | Treoniini | In Finnish = T | Treonin | In Swedish = T | Treonin | In Turkish = T | Треонін | In Ukrainian = T | 蘇氨酸 | In Chinese |
In Italian | → Biochemistry, biophysics |
| T | Timina = T | Thymine | In English = T | ثايمين | In Arabic = T | Timina | In Catalan = T | Thymin | In Czech = T | Thymin | In Danish = T | Thymin | In German = T | Θυμίνη | In Greek = T | Timina | In Spanish = T | Timino | In Esperanto = T | Timina | In Galician = T | Thymine | In French = T | Timin | In Indonesian = T | תימין | In Hebrew = T | Timinas | In Lithuanian = T | Timin | In Hungarian = T | Thymine | In Dutch = T | チミン | In Japanese = T | Tymin | In Norwegian = T | Tymina | In Polish = T | Timina | In Portuguese = T | Тимин | In Russian = T | Timin | In Slovenian = T | Тимин | In Serbian = T | 胸腺嘧啶 | In Chinese = T | Тимін | In Ukrainian = T | Timin | In Turkish = T | Timin | In Serbo-Croatian = T | ไทมีน | In Thai = T | Tymiini | In Finnish = T | Tymin | In Swedish |
In Italian | → Genetics → Biochemistry, biophysics |
| TAR | Tribunale Amministrativo Regionale | In Italian | → Law, jurisprudence → Public administration, government |
| TARM | Test di Accertamento dei Requisiti Minimi | In Italian | → Higher education, universities |
| TdE | Transalpina di Energia | In Italian | → Energy economics |
| TerCo | Osservatorio Astronomico di Collurania Teramo - Contributi | In Italian | → Serial publications, periodicals → Astronomy |
| TerMm | Osservatorio Astronomico di Collurania Teramo - Memorie ed Osservazioni | In Italian | → Serial publications, periodicals → Astronomy |
| TerNC | Osservatorio Astronomico di Collurania Teramo - Note e Comunicazioni | In Italian | → Serial publications, periodicals → Astronomy |
| TILS | Traduzione, Interpretazione e Linguaggi Specialistici | In Italian | → Linguistics |
| TN | Terra Nuova | In Italian | → Organizations and associations |
| TNT | Trinitrotoluene = TNT | Trinitrotoluol | In German = TNT | Trinitrotoluè | In Catalan = TNT | Trinitrotoluen | In Czech = TNT | Trinitrotoluene | In English = TNT | Trinitrotolueno | In Esperanto = TNT | Trinitrotolueno | In Spanish = TNT | Trinitrotoluenori | In Basque = TNT | ترینیتروتولوئن | In Persian = TNT | Trinitrotoluène | In French = TNT | Trinitrotoluolas | In Lithuanian = TNT | Trinitrotolueen | In Dutch = TNT | Trinitrotoluen | In Nynorsk = TNT | Trinitrotoluen | In Norwegian = TNT | Trinitrotolueno | In Portuguese = TNT | Trinitrotoluen | In Romanian = TNT | Тринитротолуол | In Russian = TNT | Trinitrotoluen | In Slovenian = ТНТ | Тринитротоулен | In Serbian = TNT | ทีเอ็นที | In Thai = TNT | Trinitrotoluen | In Turkish = ТНТ | Тринітротолуол | In Ukrainian |
In Italian | → Chemicals → Military engineering |
| TreP | Osservatorio Privato Specola Ariel Treviso Italia - Pubblicazione | In Italian | → Serial publications, periodicals → Astronomy |
| TriP | Osservatorio Astronomico di Trieste - Pubblicazioni | In Italian | → Serial publications, periodicals → Astronomy |
| U | Uranio = U | Uranio | In Esperanto = U | Uranium | In French = U | Uran | ALS = U | يورانيوم | In French = U | Uran | In Azerbaijani = U | Уран | In Belarusian = U | Уран | In Bulgarian = U | ইউরেনিয়াম | In Bengali = U | Uranijum | In Bosnian = U | Urani | In Catalan = U | Uraniu | In Corsican = U | Uran | In Czech = U | Uran | In Danish = U | Uran | In German = U | Ουράνιο | In Greek = U | Uranium | In English = U | Uranio | In Spanish = U | Uraan | In Estonian = U | Uranio | In Basque = U | اورانیوم | In Persian = U | Uraani | In Finnish = U | Urani | In Friulian = U | Uranio | In Galician = U | אורניום | In Hebrew = U | Uranij | In Croatian = U | Iranyòm | HT = U | Urán | In Hungarian = U | Ուրան (տարր) | In Armenian = U | Uranium | In Indonesian = U | Uranio | In Ido = U | Úran | In Icelandic = U | ウラン | In Japanese = U | jinmrvurani | JBO = U | ಯುರೇನಿಯಮ್ | KN = U | 우라늄 | In Korean = U | Uranium | In Latin = U | Uran | In Letzeburgesh = U | Uranas | In Lithuanian = U | Urāns | In Latvian = U | യുറേനിയം | In Malayalam = U | Ilhuicateōtepoztli | En Nahuatl = U | Uran | NDS = U | Uranium | In Dutch = U | Uran | In Nynorsk = U | Uran | In Norwegian = U | Uran | In Polish = U | Urânio | In Portuguese = U | Uranyu | In Quechua = U | Uraniu | In Romanian = U | Уран | In Russian = U | यूरानियम | In Sanskrit = U | Uraniu | In Sicilian = U | Uranijum | In Serbo-Croatian = U | Urán | In Slovak = U | Uran | In Slovenian = U | Urani | SQ = U | Уранијум | In Serbian = U | Uran | In Swedish = U | Urani | In Swahili = U | யுரேனியம் | In Tamil = U | ยูเรเนียม | In Thai = U | Uranyo | In Tagalog = U | Uranyum | In Turkish = U | Уран | In Ukrainian = U | Urani | In Vietnamese = U | 鈾 | In Chinese |
In Italian | → Chemistry |
| UCCA | Unione Circoli Cinematografici Arci (www.ucca.it) | In Italian | → Organizations and associations → Cinema, movies |
| UCSEI | Ufficio Centrale Studenti Esteri in Italia | In Italian | → Organizations and associations → Higher education, universities |
| UEM | Unione Economica e Monetaria = UEM | Unión Económica y Monetaria | In Spanish = EMU | Economische Monetaire Unie | VLS = EMU | Economic and Monetary Union | In English = EMU | Ekonomiska och monetära unionen | In Swedish = UGiW | Unia Gospodarcza i Walutowa | In Polish = EMU | Economische en Monetaire Unie | In Dutch = EWG | Europäesch Wirtschafts- a Währungsunioun | In Letzeburgesh = EGMU | Európai Gazdasági és Monetáris Unió | In Hungarian = UEM | Union économique et monétaire | In French = EWWU | Europäische Wirtschafts- und Währungsunion | In German = ØMU | Økonomiske og Monetære Union | In Danish = EMU | Evropská měnová unie | In Czech = UEM | Unió econòmica i monetària | In Catalan |
In Italian | → Economics → European Union |
| UIC | Unione Italiana Casting (www.unioneitalianacasting.it) | In Italian | → Organizations and associations → Cinema, movies |
| UICC | Unione Italiana Circoli del Cinema (www.uicc.it) | In Italian | → Organizations and associations → Cinema, movies |
| UIL | Unione Italiana del Lavoro (www.uil.it) | In Italian | → Organizations and associations → Labour, labour economics |
| UMA | Unione del Maghreb Arabo = SAM | Svaz arabského Maghrebu | In Czech = UMA | Union du Maghreb Arabe | In French = UMA | Unaniezh Maghrib Arab | In Breton = UMA | Unión del Magreb Árabe | In Spanish = AMU | Arabische Maghreb-Union | In German = UMA | União do Maghreb Árabe | In Portuguese = САМ | Союз арабского Магриба | In Russian |
In Italian | → International relations |
| UMMI | Unione Medico Missionaria Italiana | In Italian | → Organizations and associations → Medicine |
| UNAC | Unione Nazionale Autori e Cinetecnici | In Italian | → Organizations and associations → Cinema, movies |
| UNASP | Unione Nazionale Arti e Spettacolo | In Italian | → Organizations and associations → Arts → Cinema, movies |
| UNCI | Unione Nazionale Cooperative Italiane | In Italian | → Organizations and associations → Trade |
| UNEFA | Unione Esportatori Film e Audivisivi | In Italian | → Organizations and associations → Cinema, movies |
| UNITEC | Unione Nazionale Industrie Tecniche Cinematografiche Audiovisive | In Italian | → Organizations and associations → Cinema, movies |
| UNSA | Unione Nazionale Scrittori e Artisti | In Italian | → Organizations and associations → Language, linguistics, literature |
| URP | Ufficio Relazioni con il Pubblico | In Italian | |
| URSS | Unione delle Repubbliche Socialiste Sovietiche = URSS | Unaniezh ar Republikoù Sokialour Soviedel | In Breton = URSS | Union des Républiques Socialistes Soviétiques | In French = USSR | Unie van Sosialistiese Sowjetrepublieke | In Afrikaans = USSR | Union of Soviet Socialist Republics | In English = СССР | Сою́з Сове́тских Социалисти́ческих Респу́блик | In Russian = CCCP | Съюзът на съветските социалистически републики | In Bulgarian = SSSR | Soyuz Sovetskikh Sotsialisticheskikh Respublik | In Russian = URSS | Unión de Republicas Sozialistas Sobieticas | In Aragonese = XRSS | Xunión de les Repúbliques Socialistes Soviétiques | In Asturian = SSRİ | Sovet Sosialist Respublikaları İttifaqı | In Azerbaijani = TSRS | Tarybu Socialistiniu Respubliku Sajunga | In Baltic languages = SSSR | Savez Sovjetskih Socijalističkih Republika | In Serbo-Croatian = URSS | Unió de Repúbliques Socialistes Soviètiques | In Catalan = SSSR | Svaz sovětských socialistických republik | In Czech = USSR | Unio de Sovetaj Socialismaj Respublikoj | In Esperanto = CCCP | Социаллă Совет Республикисен Союзĕ | In Chuvash = USSR | Unionen af Socialistiske Sovjetrepublikker | In Danish = ZSRR | Związek Socjalistycznych Republik Radzieckich | In Polish = SSKS | Szovjet Szocialista Köztársaságok Szövetsége | In Hungarian = UdSSR | Union der Sozialistischen Sowjetrepubliken | In German = ΕΣΣΔ | Ένωση Σοβιετικών Σοσιαλιστικών Δημοκρατιών | In Greek = URSS | Unión de Repúblicas Socialistas Soviéticas | In Spanish = NSVL | Nõukogude Sotsialistlike Vabariikide Liit | In Estonian = SESB | Sobietar Errepublika Sozialisten Batasuna | In Basque = USSR | Uny fan Sosjalistyske Sowjetrepublyken | In Frisian = ԽՍՀՄ | Խորհրդային Սոցիալիստական Հանրապետությունների Միություն | In Armenian = URSS | Unión das Repúblicas Socialistas Soviéticas | In Galician = სსრკ | საბჭოთა სოციალისტური რესპუბლიკების კავშირი | In Georgian = URSS | Unio Rerum Publicarum Socialisticarum Sovieticarum | In Latin = CCPC | Советтик Социалисттик Республикалар Союзу | In Kirghiz = UdSSR | Unioun vun de Sozialistesche Sowjetrepubliken | In Letzeburgesh = PSRS | Padomju Sociālistisko Republiku Savienība | In Latvian = СССР | Сојуз на Советските Социјалистички Републики | In Macedonian = УРСС | Униуня Републичилор советиче Сочиалисте | In Moldavan = KRSS | Kesatuan Republik Sosialis Soviet | In Malay = USSR | Unie van Socialistische Sovjetrepublieken | In Dutch = SSSR | Sambandet av Sosialistiske Sovjet-Republikkar | In Nynorsk = SSSR | Samveldet av sovjetiske sosialistrepublikker | In Norwegian = URSS | Unnion d'Républyiques Socialistes Soviétiques | In Norman = URSS | União das Repúblicas Socialistas Soviéticas | In Portuguese = URSS | Union de las Republicas Socialistas Sovieticas | In Occitan = SSRH | Susyalista Suwit Republikakunap Huñun | In Quechua = ССРЦ | Советон Социалистон Республикæты Цæдис | In Ossetian = URSS | Uniunea Republicilor Sovietice Socialiste | In Romanian = URSS | Unioni dî ripùbblichi sucialisti suviètichi | In Sicilian = ZSSR | Zveza sovjetskih socialističnih republik | In Slovenian = СССР | Савез Совјетских Социјалистичких Република | In Serbian = SSCB | Sovyet Sosyalist Cumhuriyetler Birliği | In Turkish = СРСР | Союз Радянських Соціалістичних Республік | In Ukrainian = SSRB | Sovet Sosialistik Republiklar Berlege | In Tatar = SSRI | Sovet Sotsialistik Respublikalar Ittifoqi | In Uzbek |
In Italian | → International relations → Geography |
| USAM | Ufficio Generale Spazio Aereo e Meteorologia | In Italian | → Meteorology, climatology → Aeronautics, aircraft |
| USSPI | Unione Sindacati Professionalisti Pubblico - Privato Impiego | In Italian | → Organizations and associations → Labour, labour economics |
| UVISP | Unione Volontariato Internazionale per lo Sviluppo e la Pace | In Italian | → Organizations and associations → Development |
| V | Valina = V | Valine | In English = V | Valina | In Catalan = V | Valin | In Czech = V | Valin | In Danish = V | Valin | In German = V | Valina | In Spanish = V | Valino | In Esperanto = V | Valine | In French = V | 발린 | In Korean = V | Valin | In Croatian = V | Valin | In Indonesian = V | :ולין | In Hebrew = V | Valīns | In Latvian = V | Valin | In Letzeburgesh = V | Valinas | In Lithuanian = V | Valine | In Dutch = V | バリン | In Japanese = V | Walina | In Polish = V | Valina | In Portuguese = V | Валин | In Russian = V | Valină | In Romanian = V | Valiini | In Finnish = V | Valin | In Swedish = V | Valin | In Turkish = V | Валін | In Ukrainian = V | 缬氨酸 | In Chinese |
In Italian | → Biochemistry, biophysics |
| VatCo | Specola Astronomica Vaticana, Comunicazione | In Italian | → Serial publications, periodicals → Astronomy |
| VatMA | Specola Astronomica Vaticana, Miscellanea Astronomica | In Italian | → Serial publications, periodicals → Astronomy |
| VatRA | Specola Astronomica Vaticana, Richerche Astronomiche | In Italian | → Serial publications, periodicals → Astronomy |
| VatRS | Specola Astronomica Vaticana, Ricerche Spettroscopiche | In Italian | → Serial publications, periodicals → Astronomy |
| VES | Velocità di eritrosedimentazione = BSE | Bezinkingssnelheid van de erythrocyten | In Dutch = ESR | Erythrozytensedimentationsrate | In German = ESR | Erythrocyte Sedimentation Rate | In English = ENG | Eritrocitų nusėdimo greitis | In Lithuanian |
In Italian | → Blood and circulatory system |
| VIDES | Volontariato Internazionale Donna Educazione Sviluppo | In Italian | → Organizations and associations → Education → Development |
| VIS | Volontariato Internazionale per lo Sviluppo | In Italian | → Organizations and associations → Development |
| VISBA | Volontari Internazionali Scuola Beato Angelico | In Italian | → Organizations and associations → Christianity |
| VISPE | Volontari Italiani Solidarietà Paesi Emergenti | In Italian | → Organizations and associations |
| W | Triptofano = W | Tryptophan | In English = W | ট্রিপ্টোফ্যান | In Bengali = W | Triptòfan | In Catalan = W | Tryptofan | In Danish = W | Tryptophan | In German = W | Triptófano | In Spanish = W | Triptofano | In Esperanto = W | Tryptophane | In French = W | 트립토판 | In Korean = W | Triptofan | In Indonesian = W | טריפטופן | In Hebrew = W | Triptofāns | In Latvian = W | Tryptophan | In Letzeburgesh = W | Triptofanas | In Lithuanian = W | Tryptofaan | In Dutch = W | トリプトファン | In Japanese = W | Tryptofan | In Norwegian = W | Tryptofan | In Polish = W | Triptófano | In Portuguese = W | Triptofan | In Romanian = W | Триптофан | In Russian = W | Tryptofán | In Slovak = W | Tryptofaani | In Finnish = W | Tryptofan | In Swedish = W | Triptofan | In Turkish = W | Триптофан | In Ukrainian = W | 色氨酸 | In Chinese |
In Italian | → Biochemistry, biophysics |
| Y | Tirosina = Y | Tyrosine | In English = Y | تيروسين | In Arabic = Y | Tirosina | In Catalan = Y | Tyrosin | In Danish = Y | Tyrosin | In German = Y | Tirosina | In Spanish = Y | Tirozino | In Esperanto = Y | Tyrosine | In French = Y | 티로신 | In Korean = Y | Tirosin | In Indonesian = Y | טירוזין | In Hebrew = Y | Tirozīns | In Latvian = Y | Tyrosin | In Letzeburgesh = Y | Tirozinas | In Lithuanian = Y | Tyrosine | In Dutch = Y | ja:チロシン | In Japanese = Y | Tyrozyna | In Polish = Y | Tirosina | In Portuguese = Y | Тирозин | In Russian = Y | Tirosin | SU = Y | Tyrosiini | In Finnish = Y | Tyrosin | In Swedish = Y | Тирозин | In Ukrainian = Y | 酪氨酸 | In Chinese |
In Italian | → Biochemistry, biophysics |