| Acronym | Sense | Language | Topics |
|---|---|---|---|
| ACU | Annunciator Control Unit | In English | |
| ACU | Avionics Cooling Unit | In English | → Aeronautics, aircraft |
| Acu | Acustica | In Latin | → Serial publications, periodicals → Acoustics |
| ACU | Australian Catholic University (www.acu.edu.au) | In English | → Higher education, universities → 271 → Australia |