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COS

COS	Carry-On Oxygen System	In English
COS	Checkout Station	In English
COS	Console Operating System	In English	→ Operating systems
COS	Comité d'Orientation Scientifique	In French	→ Mathematics and natural sciences
COS	Comité des Oeuvres Sociales	In French	→ Social welfare
COS	Coefficient d'Occupation des Sols	In French	→ Accommodation → Regional planning
COS	Complément d'Objet Second	In French	→ Language, linguistics, literature

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