UAEUnexpected Application Error
UAFUser Authorization File (VMS)
UARTUniversal Asynchronous Receiver/Transmitter
UCSUniversal Character Set
UDPUser Datagram Protocol
UHF-RFIDUltra High Frequency Radio Frequency Identificatio
UICUser Identification Code (VMS)
UILUser Interface Language (VMS)
UIMSUser-Interface Management System
ULTRIXUNIX-Variante (von DEC)
UMAUpper Memory Area (MS-DOS: Adaptersegment, von 640 KB bis 1 MB)
UMAUniform Memory Architecture (symmetrische Speicher-Architektur)
UMBUpper Memory Blocks (MS-DOS: Speicherblöcke im UMA)
UMTSUniversal Mobile Telecommunications System
UNIXnot MULTICS (Betriebssystem)
UPCUniversal Product Code (Strichcode)
UploadDatei aus dem Internet hochladen
UPNUmgekehrte polnische Notation (erst Operanden, dann Operator)
UPSUninterruptible Power Supply (Unterbrechungsfreie Stromversorgung)
URLUniform Resource Locator
URLLCUltra Reliable Low Latency Communication
USARTUniversal Synchronous Asynchronous Receiver/Transmitter
UsenetUsers' Network (Informationssystem auf Internet)
USGUNIX Support Group (UNIX System III + V)
USRTUniversal Synchronous Receiver/Transmitter
USVUnterbrechungsfreie Stromversorgung
USVUnterbrechungsfreie Stromversorgung
UTCUniversal Time Coordinated (universelles Zeitformat)
UTF-8UCS Transformation Format 8-bit
UTPUnshielded Twisted Pair (Zwei- oder Vierdrahtverbindung)
UUCPUnix-to-Unix Copy (Datenaustausch (Mail) zwischen UNIX-Maschinen)