PABX Private Automatic Branch Exchange
PAD Packet Assembler Disassembler—ASCII gateway to X.25 networks
PAR `PAR?'—command on PAD to display PAD parameters
RMIT Royal Melbourne Institute of Technology
RTG Radioisotope Thermoelectric Generator, space probe Galileo's plutonium-based power system
RTM Robert Tappan Morris (Jr), the Cornell University student who wrote the Internet worm, also known as the RTM worm
Scanner A program which scans and compiles information, such as a list of NUAs
SPAN Space Physics Analysis Network: global DECNET- based network, primarily controlled by NASA
Sprint US telecommunications company, an X.25 network provider
Sprinter Word used by some Australian and English hackers to denote scanner. Derived from scanning attacks on Sprint communications