[1] Signalling Protocol and Switching (technisches Komitee der ETSI)
[2] Solar Power Satellite {Weltraumfahrt}
[3] Speicherprogrammierbare Steuerungen
[4] Secondary Propulsion System
[5] Society of Physical Students
[6] Symbolic Programming System (->"IEEE Standard Dictionary")
[7] Standby Power Supply - Batteriegepufferte Stromversorgung
[8] Structured PostScript
[9] Samples Per Second (->"NASA Acronym List")
[10] Shuttle Procedure Simulator (->"NASA Acronym List")
[11] Wichita Falls-Sheppard AFB, TX, USA -internationale Fughafen-Kennung