sing - sona
- singing
- singing arc
- singing limit
- singing margin
- singing path
- singing point
- singing point equivalent
- singing point frequency
- singing point test set
- singing stability
- singing suppressor
- singing tone
- single
- single beam
- single bearing
- single break
- single bus bar
- single cable
- single cell
- single collision
- single column disconnector
- single command
- single commutation direct-current signalling
- single conductor
- single connection
- single contact
- single converter
- single cord
- single cotton covering
- single crystal
- single crystal of tungsten
- single crystal reactive etching and metalization
- single current
- single density
- single digit code
- single diode
- single dipole
- single disk brake
- single dislocation
- single drive
