| 1. | (character) | SYN - Synchronous idle. | |
| 2. | (language) | SYN - A syntactic specification language for COPS. ["Metalanguages of the Compiler Production System COPS", J. Borowiec, in GI Fachgesprach "Compiler-Compiler", ed W. Henhapl, Tech Hochs Darmstadt 1978, pp. 122-159]. |