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ramjet - type of jet engine in which the air drawn in for combustion is compressed solely by the forward motion of the aircraft

RFID - Radio Frequency Identification

RFS - Renewable Fuel Standard (Low-cost cellulosic biofuel production)

RNC - Radio Network Controller (EV-DO Rev A release 8)

RPP - rapid prototyping platform

RSS - Rich Site Summary; Really Simple Syndication; Rotating Shadowband Spectroradiometer

RTOS - Real Time Operating System as used in avionics