| I | NTC/0INTC/0Integrated Checkout | - | Organizations |
| I | LAS Instrument Landing Approach System | - | Organizations |
| I | LSP IntegratedLogistics Support Plan | - | Organizations |
| I | DAC Integrated Digital-Analog Converter | - | Organizations |
| I | DAS Integrated Data Acquisition System | - | Organizations |
| I | DPS Interface Digital Processor | - | Organizations |
| I | ECM Induced Environment Contamination Monitor | - | Organizations |
| I | ECO Inboard Engine Cutoff | - | Organizations |
| I | LCCS Integrated Launch Control And Checkout System | - | Organizations |
| I | D&CA Inverter Distribution And Control Assembly | - | Organizations |
| I | FIntermediate Frequency | - | Organizations |
| I | Iodine - One (in Roman Numerals) | - | Astronomy |
