| Subject | English | Thesaurus |
| abbr. | Career Options On Line | COOL |
| abbr., telecom. | CF line | carrier frequency line |
| railw., abbr. | Costa Line Cargo Services | CLGU |
| abbr., file.ext. | Culham One-line Single Experimental Consol | COSEC |
| IT, abbr. | Integrated Services Line Module | ISLM |
| IT, abbr. | Integrated Services Line Unit | ISLU |
| IT, abbr. | Remote Integrated Services Line Unit | RISLU |
| O&G. tech. | service line valve | SLV (MichaelBurov) |
| mil., abbr. | Single Line Missile Assembly | SLMA |
| mil., abbr. | Single Line Missile Assembly Building | SLMAB |
| abbr., scottish | Vertical Line Arrange DIFAR | VLAD |
| AMEX., abbr. | Wireless On- Line Services | WOLS |
