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- (electronics) Abbreviation of receive.
RX (countable and uncountable, plural RXs)
- (motorsports) Abbreviation of rallycross. (a motorsport)
- Abbreviation of receiver.
- -X (“-cross”) (crosscountry)
- MX (“motocross”)
- SX (“supercross”) (motorcycling)
- BMX (“bicycle motocross”)
- SBX (“snowboardcross”)
- SX (“skicross”) (skiing)
- IX (“icecross”) (skating)