| Acronym | Meaning |
| OPAC | Online Public Access Catalogue |
| BCIS | Battlefield Combat Identification System |
| 4D | Four-dimensional (usually Three Spatial Plus One Temporal Dimension |
| C3I OR C?I | Command |
| ITU | Intent-to-Use - International Telecommunication Union (International Telegraph Union 1865-1932) |
| TK | Turkmen Language (ISO 639-1 Code) |
| GEL | Georgian Lari (ISO 4217 Currency Code) - Gilbert And Ellice Islands (ISO 3166 Trigram; Obsolete 1977) |
| TSA | Theatre Storage Area - Time Slot Allocation - Transportation Security Administration |
| R&D | Research & Development |
| POR | Portuguese Language (ISO 639-2 Code) |