VSS

Noun

 * 1)  Virgin SpaceShip &mdash; spaceship prefix for Virgin Galactic spacelines
 * 2)  vehicle speed sensor
 * 3)  virtual switching system
 * 4)  variable structure system
 * 5)  volatile suspended solids

Proper noun

 * 1)  Microsoft
 * 2)  Virtual Security System software
 * 1)  Virtual Security System software

Symbol

 * , apparent volume of distribution at steady state
 * , one of the power-supply pins on some integrated circuits

Coordinate terms

 * VCC