Abkürzungverzeichnis für U
| Link | Artikel |
| U unit (EN) | |
| U Spannung (DE) | |
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| U_Port universal port (EN) | |
| U-frame unnumbered frame (EN) | |
| U-TDOA uplink time difference of arrival (UMTS) (EN) | |
| U/C up converter (EN) | |
| U/f Spannungs-Frequenz-Wandler (DE) | |
| U/FTP unshielded foiled twisted pair (EN) | |
| U/M user/message (Slot) (EN) | |
| U/STP unscreened shielded twisted pair (EN) | |
| U/UTP unshielded unshielded twisted pair (EN) | |
| U2F universal second factor (2FA) (EN) | |
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| UA unnumbered acknowledgement (HDLC) (EN) | |
| UA user agent (EN) | |
| UAA universally administrated address (EN) | |
| UAA unified audio architecture (Microsoft) (EN) | |
| UAC universal access control (EN) | |
| UAC user access control (EN) | |
| UAC user agent client (H.323) (EN) | |
| UAC unbalanced asynchronous class (HDLC) (EN) | |
| UAD user account database (EN) | |
| UADSL universal ADSL (EN) | |
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| UAE user agent entity (X.400) (EN) | |
| UAE unexpected application error (EN) | |
| UAF user authorization file (EN) | |
| UAF universal authentication framework (FIDO) (EN) | |
| UAI Unternehmensanwendungsintegration (DE) | |
| UAL user access line (X.25) (EN) | |
| UAL user agent layer (X.400) (EN) | |
| UAM user authentication module (EN) | |
| UAM universal access method (WLAN) (EN) | |
| UAN universe area network (EN) | |
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| UAN universal access number (CS, IN) (EN) | |
| UAP user account protection (Windows) (EN) | |
| UAP upper address part (Bluetooth) (EN) | |
| UAPDU user agent protocol data unit (MHS) (EN) | |
| UART universal asynchronous receiver/transmitter (EN) | |
| UAS unavailable second (EN) | |
| UAS ultrasonic alarm system (automotive) (EN) | |
| UAS user agent server (H.323) (EN) | |
| UAT user acceptance test (EN) | |
| UAV unmanned aerial vehicle (drone) (EN) | |
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| UAWG universal ADSL working group (EN) |