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A B C D E F G H I J K L M N O P Q R S T U V W X Y Z 0-9

U
Abbreviation for the "modular Unit" on which rack panel heights are based. According to EIA and ANSI standards one modular rack unit (1U) is 1.75" tall (that's 44.25 millimeters for those of you in the rest of the world). Accordingly 2U would be 3.5" tall, and so on. These modular units are also referred to as rack units or rack spaces. The holes in a standard rack rail are spaced according to these specs and most of the rack mountable equipment we use is designed to occupy a fixed number of rack spaces (1U, 2U, 3U, etc.)

U

U-Boat

Umatic (1610/1630)

UART

UDF - Universal Disc Format

UDMA

Ultra High Frequency

UI

Ukelele

UL

Ultra160 SCSI

Ultra2 SCSI

Ultra2 Wide SCSI

Ultra ATA

Ultra SCSI

Ultrasonic

Ultra Wide SCSI

 Una Corda

Unbalanced

Unburst

Uncolored

Uncompressed

Undo

Unformatted Capacity

Uni-Vibe

Unidirectional

Uninstall

Uninstaller

Uninterruptible Power Supply

Unison

Unity Gain

Universal Binary

UNIX

Unobtanium

 UPC Barcode

Update

Upgrade

Upload

UPS

Upsampling

URL

USB

USB 2

USB Hub

USB Key

User Data

User Friendly

User Interface

User Preset

Utility

UV-22

     
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