| Acronym | Meaning |
| LISA | Laser Interferometer Space Antenna |
| AFV | Armoured Fighting Vehicle |
| COEIA | Combined Operational Effectiveness And Investment Appraisal (military) |
| PR | Public Relations -Puerto Rico (postal Symbol; ISO 3166 Digram) |
| GOMER | Get Out Of My Emergency Room (derogatory Reference To Hypochondriac Patients) |
| SOI | Signal Operating Instruction |
| ORNL | Oak Ridge National Laboratory |
| MHWS | Mean High Water Springs (nautical Charts) |
| FEF | Frontal Eye Field (neurophysiology) |
| TFMPP | Trifluorophenylmethylpiperazine |