| Acronym | Meaning |
| AGTS | Advanced Gunnery Training System |
| OB | Obiit (Latin |
| MEL | Maya Embedded Language - Michigan Electronic Library |
| DES | Deep Ecliptic Survey |
| SBCS | Single-Byte Character Set |
| K/T | Cretaceous/Tertiary Boundary |
| 4D | Four-dimensional (usually Three Spatial Plus One Temporal Dimension |
| LOTA | Licentiate Of The Orthodontic Technicians Association |
| RDDL | Resource Directory Description Language (riddle) |
| KHR | Cambodian Riel (ISO 4217 Currency Code) |