- 1. Stand-by Power Supply. A cheaper form of UPS (see UPS for comparison).
- 2. State Plane System. A system covering all of the United
States for specifying local Cartesian coordinates. State Plane (coordinate) System divides each state into a number of
zones, each of which can be treated as a grid.
Also more generally known as the "State Place Coordinate System" (SPCS). See SPCS for details.