| Acronym | Meaning |
| DAN | Danish Language (ISO 639-2 Code) |
| AOU | American Ornithologists' Union |
| APOLLO | Apache Point Observatory Lunar Laser-ranging Operation |
| LN | Lingala Language (ISO 639-1 Code) - Natural Logarithm |
| OMB | U.S. Office Of Management And Budget - Ontario Municipal Board -Order Of Mapungubwe In Bronze |
| OOP | Object-Oriented Programming - Out Of Print |
| PB | Lead (Latin Plumbum) |
| BPM | Beats Per Minute |
| LI | Fifty-one (in Roman Numerals) -Liberia (FIPS 10-4 Country Code) - Liechtenstein (ISO 3166 Digram) |
| CHE | Switzerland (ISO 3166 Trigram; From Latin Confoederatio Helvetica) |