| ISFOC | ISFOG | IS&FP | ISFP | ISFPWG |
| ISFQ | ISFR | ISFRD | ISFRM | ISFRS |
| ISFS | ISFSA | ISFSE | ISFSF | ISFSFF |
| ISFSI | ISFSP | ISFSS | ISFST | ISFT |
| ISFTA | ISFTC | ISFU | ISFUG | ISFUROS |
| ISFV | ISFWA | ISFWC | ITTPOI | ITTR |
| ITTS | ITTSS | ITTT | ITTTA | ITTTI |
| ITTU | ITTV | ITTY | ITU | ITUA |
| ITUAM | ITUBR | ITUC | ITUCK | ITUD |
| ITU-D | ITUDOCS | ITUE | ITUG | ITUH |
| ITU-LAND | ITUM | ITUMF | ITUn | ITU National Point Code |
| ITunes Music and Movie Store | iTunes Podcast | iTunes Protocol | ITUP | ITUR |
| ITU-R | ITU Radiocommunication Sector | Iturralde Crater Expedition | ITUSA | ITUSC |
| IT-USE | ITU-T | ITUT | ITU-T Advisory Committee - Telecommunications | ITU Telecommunication Development Sector |
| ITU Telecommunications Development Sector | ITU-T Recommendation Experiment Group | ITU-TSB | ITUTSB | ITUTSS |
| ITU-TSS | IT&V | ITV | ITV1 | ITV2 |
| ITV3 | ITVA | ITVB | ITVC | ITVE |
| IT&VE | ITVERP | ITVET | ITVETS | ITVF |
| ITVGS | IT/VI | ITVL | ITVM | ITVN |
| ITVS | ITVSDA | ITVT | ITVU | ITVUS |
| ITVV | ITW | ITWA | ITW/AA | ITWAA |
| ITW/AA Configuration Control System | ITWAS | It Was Not My Fault | It Was Not Our Fault | ITWC |
| ITWD | ITWF | ITWG | ITWL | ITWLSA |
| ITWM | ITWO | ITWOM | It Works for Me | It Works on My Machine |
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