| Acronym | Meaning |
| LKA | Sri Lanka (ISO 3166 Trigram) |
| RUC | Royal Ulster Constabulary |
| USNR | United States Navy Reserve |
| SDN | Sudan (ISO 3166 Trigram) |
| PTUI | Plain-Text User Interface (pa-too-ey) (cf CLI) |
| LOTIS | Livermore Optical Transient Imaging System |
| AV | Avar Language (ISO 639-1 Code) |
| NOLF | Navy OutLying Field |
| STP | S?o Tom? And Prncipe (ISO 3166 Trigram) -Standard Temperature And Pressure |
| LABVIEW | Laboratory Virtual Instrumentation Engineering Workbench |