| Abbreviation | Definition |
|---|---|
| WWE | Westerly Wind Event |
| WWMS | Waste Water Management System |
| WWW | World Wide Web |
| WWZ | Western War Zone |
| WX | Weather |
| WXAP | Weather Accident Prevention project |
| WY | Wrist Yaw |
| WYPT | Waypoint |
| WYU | What You Use |
| WZSM | Work Zone Safety Manual |
| WZTD | Wet Zenith Tropospheric Delay |
| X | Trans- |
| X' | X-axis Rate of Change |
| X'' | X-axis Rate of Acceleration |
| XCVR | Transceiver |
| XDA | X-ray Detector Assembly |
| XDC | External Data Center |
| XDCR | Transducer |
| XDR | External Data Representation |
| XDT | XUV Doppler Telescope |