| FIFO | Inventory system, for short |
| HEX | 16-digit numbering system, for short |
| SERVO | Machine control system, for short |
| DPL | Surround-sound speaker system, for short |
| GOVT | Political system, for short |
| HIFI | Stereo system, for short |
| SATNAV | Geo-spacial positioning system, for short |
| ASL | Digital communication system, for short |
| LAN | Device-linking system, for short |
| ABO | Blood system, for short |
| SMS | Text-messaging system, for short |
| GPS | Navigational system, for short |
| CAM | Part of a security system, for short |
| HVAC | Temperature-control system, for short |
| CCTV | Video surveillance system, for short |
| IPA | Linguist's notation system, for short |
| BACS | Direct debit payment clearing system, for short |
| SLR | Camera with a mirror-and-prism system, for short |
| AHCA | Bill that promises to overhaul the medical system, for short |
| RFDS | Country mail systems, for short |
