W-day stands for declared by the NCA, W-day is associated with an adversary decision to prepare for war (US DoD)
W-PYT stands for Wheat Preliminary Yield Trial (agriculture)
W-PAC stands for Western Pacific Satellite (DSCS)
W-PBX stands for Wireless Private Branch Exchange
W-QLI stands for Wisconsin Quality of Life Index (questionnaire)
W-CWM stands for Wireless Collision Warning Message
W-DEQ stands for Wijma Delivery Expectancy/ Experience Questionnaire (psychology)
W-CDMA stands for Wideband Code Division Multiple Access
W-DFSE stands for Whitened Decision-Feedback Sequence Estimation
W-S stands for Winston-Salem (North Carolina, USA)