| Abbreviation | Definition |
|---|---|
| ISS | Ion Scattering Spectrometry/Spectroscopy |
| ISSE | In-Situ Spectroscopic Ellipsometry |
| IT | Information Technician |
| ITCB | Instantaneous-Trip Circuit Breaker |
| ITD | Impedance Threshold Device |
| ITD | Isothermal Desorption Spectrometry |
| ITEC | I.T. Electronic Controller |
| ITEC | Information Technology Electronics and Controls |
| ITEE | Information Telecommunications and Electronics Engineering |
| Iti | Transient Inward Current |
| ITO | Indium Tin Oxide |
| Ito | Transient Outward Current |
| ITP | Integrated Transmission Panel |
| ITP | Interactive Test Program |
| ITRI | Interconnection Technology Research Institute |
| ITT | Inter-Test Time |
| ITU-TSS | International Telecommunications Union - Telecommunications Standardization Sector |
| IVI | Interchangeable Virtual Instruments |
| IVNS | In-Vehicle Navigation System |
| IVP | Integrated Vacuum Processing |