| Abbreviation | Definition |
|---|---|
| IUN | Investigational Use Only |
| IUU | Ilegal , Unreported ,Unregulated |
| IUU | Illegal , Unregulated, Unreported |
| IUU | Illegal Unreported And Unregulated |
| IVDEFFUC | Integrating Vector Dimensional Energy-Force Field Unification Constant- As is considered a "One |
| IVIS | Internet Victim Information System |
| IVW | International Victimology Website |
| IWB | Inside WaistBand holster |
| IWQ | Individual Weapons Qualification |
| Ix | Investigation(s) |
| J | Judge |
| J | Judge, justice |
| J | Judgement |
| J | Judicatory |
| J | Justice |
| J | Justifiably |
| J | Juvenile |
| J&S | Judgment and Sentence |
| JA | Jurisdiction Act |
| JA | Justified Attack |