| Acronym | Meaning |
| AO | Angola (FIPS 10-4 Country Code; ISO 3166 Digram) -Approach Officer (submarine) - Area Of Operations |
| BUR | Burma (ISO 3166 Trigram; Obsolete Since 1989) |
| MDA | Main Defensive Action/Area -Moldova (ISO 3166 Trigram) - Muscular Dystrophy Association |
| OCR | Optical Character Recognition |
| Z | Zepto |
| TACAN | Tactical Air Navigation |
| BTP | British Transport Police |
| ILC | International Law Commission - International Linear Collider |
| LASER | Light Amplification By Stimulated Emission Of Radiation (cf. Maser) |
| DPDT | Double-Pole Double-Throw |