| Subject | English | Thesaurus |
| abbr. | advanced mobile telephone service | advanced mobile phone service (ssn) |
| abbr., astronaut. | American Telephone & Telegraph Co. | AT&T |
| IT, abbr. | AT&T Novell Telephone Services | ANTS (AT&T, Novell) |
| IT, abbr. | AT&T Novell Telephone Services | A/NTS (AT&T, Novell) |
| abbr., post | Bell Telephone Manufacturing Co | BTMC (manufacturer) |
| busin., abbr. | Employee Telephone Access Program | ETAP |
| abbr., scottish | MACOM Telephone Modernisation Program | MTMP (US Army) |
| mil., abbr. | MACOM Telephone Modernization Program | MTMP |
| tradem., abbr. | Manitoba Telephone Services | MTS |
| abbr., mil., BrE | Services Telephone Directory | STD |
| telecom., abbr. | Telephone Connecting Program | TCP |
