U Value (Coefficient of Heat Transmission)
UCC (Universal Copyright Convention)
UDD (Utility Distribution Diagram)
UEF (United Engineering Foundation Inc.)
UHD (Utility Head Diagram) or Utility Flow Diagram (UFD)
ULCC (Ultra Large Crude Carrier)
Ultimate Beneficial Owner (UBO)
Ultra Large Crude Carrier (ULCC)
Ultra Low Sulphur Fuel Oil (ULSFO)
UN ESCAP (United Nations Economic and Social Commission for Asia and the Pacific)
UN ID; UN Number; UN Number Code; UN/NA Number
UN PRI (UN Principles for Responsible Investment)
Unclassified Public Information
Underground Services Detail Drawing
Underground Services Specification
UNEP (United Nations Environment Programme)
UNESCO (United Nations Educational, Scientific and Cultural Organization)
UNFCC (United Nations Framework Convention on Climate Change)
UNIDO (United Nations Industrial Development Organization)
United Nations System Influenza Coordination (UNSIC)
Unrestricted Area (Non-Controlled Area)
UPS (Uninterruptible Power Supply)
UPS (Uninterruptible Power Supply) One Line Diagram
Upstream, Midstream and Downstream
URL (Uniform Resource Locator or Universal Resource Locator)
URS (User Requirement Specification)
USGS (United States Geological Survey)