| Acronym | Meaning |
| GULCR | Grupo De Usuarios De Linux De Costa Rica |
| SEM | Sensor Employment Manager |
| YS | Yottasiemens |
| C4 OR C? | Command |
| ZHO | Chinese Language (ISO 639-2 Code) |
| QLD | Queensland |
| ARM | Anti-Radiation Missile -Armenia (ISO 3166 Trigram) |
| MSIE | Microsoft Internet Explorer - Master Of Science In Industrial Engineering |
| CTDB | Compact Terrain Data Base (file Format) |
| MHWN | Mean High Water Neaps (nautical Charts) |