| Abbreviation | Definition |
|---|---|
| IOC | Input/Output Configuration |
| IOC | Input/Output Controller |
| IOCC | input/Output Control Clock |
| IOCD | Input/Output Control Device |
| IOCH | Input/Output Controller Hub |
| IOCJ | Intumescent Optical Cable Jacket |
| IOCK | Input/Output loCK |
| IOCM | Input/Output Cisco Media controller |
| IOCM | Input/Output Control Matrix |
| IOCO | Input/Output COnformance |
| IOCP | Input/Output Control Processor |
| IOCU | Input/Output Control Unit |
| IOD | Integrated Optical Density |
| IODD | Input/Output Device Description |
| IODU/C | Input/Output Disk Unit / CD-ROM |
| IOI | Input Output Interface |
| IOLB | Input-Output Logic-Based |
| IOP | Input/Output Processor |
| IOP | Intensive Operational Period |
| IORV | Inadvertently Opened Relief Valve |