| Acronym | Meaning |
| ESC | Escape Character |
| PDC | Primary Domain Controller |
| FDDI | Fiber Distributed Data Interface |
| NNTP | Network News Transfer Protocol |
| EBCDIC | Extended Binary Coded Decimal Interchange Code |
| VFAT | Virtual File Allocation Table |
| ABBH | Average Bouncing Busy Hour |
| TPI | Tracks Per Inch |
| ACES | Asia Cellular Satellite System |
| S-HTTP | Secure HTTP |