| English | Thesaurus |
| Also known as the binary system, which is the basis of computer logic. Normal counting is based on 0-9. Binary just has 0-1, which means a new column is started after two, not nine. Binary counting does not go 1,2,3, etc. It goes 0, 1, 10, 11, 100, 101, etc. | base 2 (Interex) |
| Computer Algebra System mathematical computation software | CAS (Alex Lilo) |
| Computer Assisted Message Processing System | CAMPS (NATO) |