Sheet cleaner - Syntax analysis
- Swivel head scriber
- Swivel pen
- Swiveling roll
- Swiveling roll assembly
- Swollen roller
- Sword(-type) hygrometer
- Syllabicate, syllabize
- Syllable
- Syllable stress
- Symbol
- Symbol display
- Symbol element
- Symmetric(al) objective
- Sympathetic ink
- Synchro shutter
- Synchronization
- Synchronization right
- Synchronized sheet feed
- Synchronous copying
- Synchronous text transmission