| Acronym | Meaning |
 | OTSBH | Over The Shoulder Boulder Holder |
| ISLN | International Standard Lawyer Number |
| FRS | Fellow Of The Royal Society - U.S. Federal Reserve System |
| DOI | Digital Object Identifier - U.S. Department Of The Interior |
| RF | Radio Frequency - Receptive Field (neurophysiology) |
| RI | Rhode Island (postal Symbol) |
| GMO | Genetically Modified Organism |
| CTC | Closed Timelike Curve (relativity) - (U.S.) Combat Training Center |
| IRM | Illinois Railway Museum - Inzhenernaya Razvedyvatelnaya Mashina (Russian ?????????? ???????????????? ?????? |
| AAV | Amphibious Assault Vehicle |
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