| Abbreviation | Definition |
|---|---|
| I | Input |
| I | Intensity |
| I&M | Instrumentation and Measurement |
| I/O | Input/ Output |
| I=E/R | Electrical measured current flow |
| I2 | Ion Implant (also seen as II) |
| I2C | Inter-Integrated Circuit |
| I2L | Integrated Injector Logic |
| I2TL | Introduction to Transformer Losses |
| I300I | International 300 mm Initiative |
| IA | Integrated Application |
| IA-32 | Intel 32-bit Architecture |
| IA-64 | Intel 64-bit Architecture |
| IAC | Interlocked Armor Cable |
| IAEEE | Iranian Association of Electrical and Electronic Engineers |
| IAEP | International Alliance for Electronic Payments |
| IAP | Imaging Atom Probe |
| IAS | Intelligent Assistant Systems |
| IAS | Intergrated Automation System |
| IBAE | Ion Beam Assisted Etching |