| Acronym | Meaning |
| IAD | Ion Assisted Deposition |
| CORG | (U.S.) Combat Operations Research Group |
| HSC | High School Certificate (as Used In New South Wales) |
| IRM | Illinois Railway Museum - Inzhenernaya Razvedyvatelnaya Mashina (Russian ?????????? ???????????????? ?????? |
| PF | Picofarad |
| DSP | Defense Standardization Program - Defense Support Program - Digital Signal Processing |
| GNAS | Grand National Archery Society |
| RCAR | Research Council For Automobile Repairs (are-car) |
| COPUS | U.K. Committee On The Public Understanding Of Science |
| IVM | In Vitro [Oocyte] Maturation |