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| AIX | Advanced Interactive Executive |
| ALPAR | affinity logical partition |
| APAR | authorized program analysis report |
| API | application programming interface |
| ASCII | American Standard Code for Information Interchange |
| ATS | Advanced Technical Support |
| BOS | basic operating system |
| CD | compact disc |
| CD-R | compact disc - recordable |
| CD-ROM | compact disc - read only media |
| CD/DVD | compact disc/digital versatile disc |
| CDT | central daylight time |
| CEC | central electronics complex |
| CHRP | Common Hardware Reference Platform |
| CIM | Common Interface Model |
| CIMOM | Common Interface Model Object Manager |
| CPU | central processing unit |
| CST | central standard time |
| DLPAR | dynamic logical partitioning |
| DMA | Direct Memory Access |
| DMTF | Desktop Management Task Force |
| DNS | Domain Name System |
| DR | Data Register |
| DR | dynamic reconfiguration |
| DRAF | Dynamic Reconfiguration Application Framework |
| DVD | digital versatile disc |
| DVD-RAM | digital versatile disc - random access memory |
| DVD-ROM | digital versatile disc - read only memory |
| EC | Engineering Change |
| EEH | Enhanced Error Handling |
| FC | Feature Code |
| FQDN | fully qualified domain name |
| FRU | field replaceable unit |
| FTSS | Field Technical Support Specialist |
| GB | gigabyte |
| GID | group ID |
| GPFS | General Parallel File System |
| GUI | graphical user interface |
| HACMP | high-availability cluster multiprocessing |
| HMC | Hardware Management Console |
| HPC | High Performance Computing |
| HTML | Hypertext Markup Language |
| I/O | input/output |
| IBM | International Business Machines Corporation |
| IPLA | IBM International Program License Agreement |
| ID | identification |
| IDE | internal data equipment |
| IP | Internet Protocol |
| IPL | initial program load |
| IR | Instruction Register |
| ISA | Industry Standard Architecture |
| ISO | International Organization for Standardization |
| ITSO | International Technical Support Organization |
| JFS | Journaled File System |
| KB | kilobyte |
| KDB | kernel debugger |
| LAN | local area network |
| LDAP | Lightweight Directory Access Protocol |
| LED | light emitting diode |
| LMB | logical memory block |
| LPAR | logical partitioning |
| LUN | logical unit |
| LV | logical volume |
| LVD | Low Voltage Differential |
| LVM | Logical Volume Manager |
| M/T | machine type |
| MB | megabyte |
| MCM | multichip module |
| MDL | model |
| MSR | Machine Status Register |
| NFS | Network File System |
| NIM | Network Installation Manager |
| NIS | Network Information Services |
| NVRAM | nonvolatile random access memory |
| ODM | Object Data Manager |
| OEM | original equipment manufacturer |
| OS | operating system |
| PAP | Password Authentication Protocol |
| PC | personal computer |
| PCI | peripheral component interconnect |
| PFT | Page Frame Table |
| PHB | PCI host bridge |
| PID | process ID |
| PMB | physical memory block |
| POWER | performance optimization with enhanced RISC |
| PPID | parent process ID |
| PSSP | Parallel System Support Program |
| QBB | Quad Building Block |
| R/W | read/write |
| RAM | random access memory |
| RAN | remote asynchronous node |
| RAS | reliability, availability, and serviceability |
| RDBMS | relational database management system |
| RIP | Routing Information Protocol |
| RISC | reduced instruction-set computer |
| RMC | Resource Monitoring and Control |
| RML | Real Mode Limit |
| RMO | real mode offset |
| ROM | read only memory |
| RPM | Red Hat Package Manager |
| RSCT | Reliable and Scalable Cluster Technology |
| RSPC | RISC System Personal Computer |
| RTAS | Run-Time Abstraction Service |
| S/N | serial number |
| SCSI | small computer system interface |
| SMIT | System Management Interface Tool |
| SMP | symmetric multiprocessing |
| SMS | System Management Services |
| SP | scalable parallel |
| SPOT | shared product object tree |
| SSA | serial storage architecture |
| SSH | Secure Shell |
| SSL | Secure Sockets Layer |
| TCB | trusted computing base |
| TCE | translation control entry |
| TCP | Transmission Control Protocol |
| TLB | Translation Look-aside Buffer |
| TOD | time-of-day |
| TTY | Teletype |
| UDB | Universal Database |
| UDF | Universal Disk Format |
| UID | user ID |
| UP | uniprocessor |
| URL | Universal Resource Locator |
| USB | Universal Serial Bus |
| VMM | Virtual Memory Manager |
| VPD | Vital Product Data |
| VSD | Virtual Shared Disk |
| WLM | Workload Manager |