Warehouse Management System (WMS)
Waste Water Treatment Unit (WWTU)
Water Hammer (or Hydraulic Shock)
Water Vapor Transmission Rate (WVT)
WBS (Work Breakdown Structure)
WCO (World Customs Organisation)
Weight Value (or Weight Factor)
Welding Electrode Classification
WERA (Working Ergonomic Risk Assessment)
WHO (World Health Organization)
WHRU (Waste Heat Recovery Unit)
WiFi (Wireless Fidelity or Wi-Fi)
Wind Energy Conversion System (WECS) or Device
WIPO (World Intellectual Property Organisation)
Wireless Energy Transfer (WET) or Wireless Power Transfer (WPT)
WMO (World Meteorological Organization)
Workplace Environmental Exposure Levels (WEELs)
World Nuclear Association (WNA)