Ultrakurzwelle (UKW)
Unicode
Uniform Ressource Identifier (URI)
Uniform Ressource Locator (URL)
Union Européenne de Radiodiffusion (UER)
Union Intenationale des Télécommunications (UIT)
Unique Resource Locator (URL)
Universal Mobile Telecommunication System (UMTS)
Universal Serial Bus (USB)
UNIX (UX)
Unterbrecherwerbung
Uplink