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WARC, WRC : World (Administrative) Radio Conference. Run by the International Telecommunications Union.
WARC Bands : Agreed to at the 1979 WARC, they consist of the 30m ( 10.100Mhz - 10.150MHz), 17m (18.086MHz - 18.186MHz) and 12m (24.890MHz - 24.990MHz) amateur bands.
Waveguide : A hollow tube, typically square in cross-section, used to carry microwave signals.
Wavelength : The distance in metres between corresponding points on a wave.
WIA : Wireless Institute of Australia. The national organisation for Australian hams.
WSPR : Weak Signal Propagation Reporter.
WSJT : Weak Signal Joe Taylor - named after Joe Taylor who wrote the software.
WX : Weather. See weather spotting, APRS for transmission of current meteorological readings via amateur radio. Many 2 metre handheld transceivers are also capable of extended tuning to permit reception of forecasts over VHF bands assigned to other services, such as marine radio.