| Abbreviation | Definition |
|---|---|
| IMWSR | nstrumentman (watch & Clock Repairman) Seaman Recruit |
| INAS | Indian Naval Air Squadron |
| INDP | Industry Navy Discussion Panel |
| INPA | Indian Naval Placement Agency |
| INS | Israeli Navy Ship |
| INV | Imperial Navy Vessel |
| INVA | Indian Navy Veteran Artificer |
| INW | International Naval Works |
| IRGCN | Islamic Revolution Guards Corps Navy |
| IRGCN | Islamic Revolutionary Guards Corp Navy |
| IS1 | Intelligence Specialist Petty Officer 1st Class |
| IS1 | telligence Specialist Petty Officer 1st Class |
| IS2 | Intelligence Specialist Petty Officer 2nd Class |
| IS2 | telligence Specialist Petty Officer 2nd Class |
| IS3 | Intelligence Specialist Petty Officer 3rd Class |
| IS3 | telligence Specialist Petty Officer 3rd Class |
| ISC | Intelligence Specialist Chief Petty Officer |
| ISC | telligence Specialist Chief Petty Officer |
| ISCM | Intelligence Specialist Master Chief Petty Officer |
| ISCM | telligence Specialist Master Chief Petty Officer |