| Acronym | Meaning |
| HEU | Highly Enriched Uranium |
| CPF | Calibration Parameter File - Canadian Patrol Frigate |
| INC | Iglesia Ni Cristo (Filipino |
| CAEN | Close Action Engagement (constructive Simulation) |
| SIPP | Self-Invested Personal Pension |
| SSN | Nuclear-Powered Attack Submarine (US Navy Hull Classification) -SIM Serial Number - Social Security Number - Socialist Solidarity Network - Subsystem Number (SCCP |
| ACM | Many |
| VRSG | Virtual Reality Scene Generator |
| IMRO | Irish Music Rights Organisation |
| MSM | Mount St Mary's School |