RX

RX was the common telegraph abbreviation for "receive", later used in CW. It should not be confused with Rx, used for prescriptions. It is also the IATA airline designator of Aviaexpress...

ee also

* TX, the common telegraph abbreviation for "transmit-out"
* WX, the common telegraph abbreviation for "weather"
* Q code, a standardized collection of three-letter signals, all starting with the letter "Q", initially developed for commercial radiotelegraph communication, and later adopted by other radio services, especially amateur radio.