| Abbreviation | Definition |
|---|---|
| IOCDS | Input/Output Configuration Data Set |
| IOCF | Input/Output Control Function |
| IOCH | Input/Output Control Header |
| IOCN | Input/Output Configuration Number |
| IOCP | Input/Output Completion Port |
| IOCQ | Input/Output Channel Queue |
| IOCQ | Input/Output Completion Queue |
| IOCR | Input/Output Configuration Register |
| IOCR | Input/Output Conformance Relation |
| IOCR | Input/Output Cross-Reference |
| IODU | Input/Output Disk Unit |
| ION | Individual Outage Notification |
| IOR | Interface Object Reference |
| IOS | Internet Operating System |
| IOS | Internetwork Operating System |
| IOS | Internetworking Operating System |
| IOS | Internetworking Operating System (Cisco) |
| IP | Internet Packet |
| IP | Internet Protocol |
| IPAC | Internet Public Access Catalogue |