| Acronym | Meaning |
| GTM | Guatemala (ISO 3166 Trigram) |
| HIRD | Hurd Of Interfaces Representing Depth (cf. HURD) |
| CNR | Canadian National Railway - Combat Net Radio |
| VIN | Vehicle Identification Number (ISO 3779) |
| CDMA | Code Division Multiple Access |
| ACV | Armoured Combat Vehicle |
| ZN | Zeptonewton |
| SP | Security Police - Self-Propelled - Shore Patrol -Spain (FIPS 10-4 Country Code) -Start Point - Strong Point |
| AFDB | African Development Bank |
| ON | Ontario (postal Symbol) |