U

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AcronymDefinition
UUniversity
UYou
UUpper
UUnderlined
UUnsatisfactory
UUnd (German: And)
UUnited
UUltra
UUniversal
UUpper Class
UWind Speed
UUpdate(d) (action code)
UUsed
UUtility
UUncle
UUnlimited Time (broadcasting operating schedules)
UUrgent
UUmbrella
UUnit
USunday (one letter abbreviation for day of week)
UUnified
UUtah (ammunition headstamp)
UUtility (US military aircraft designation; as in U-6 Beaver)
UKosher (from Union of Orthodox Hebrew Congregations)
UUranium
UUniform (aviation letter code)
UUnclassified
UUnitary (mathematics)
UUmpire
UAtomic Unit (measure of mass)
UUracil
UUncleared
UUnsymmetrical
UUmdrehungen (German: RPM)
UUnterseeboot (German: submarine)
UUnion Metallic Cartridge Co (division of Remington Arms; used on head stamp of .22 cartridges)
UEnvelope or Letter Sheet (Scott Catalogue prefix; philately)
UUnit of measurement for rackmount equipment (U is 1.75in or 4.44cm)
UUnknown Wind Intensity (weather reports)
UUS DoT tire speed rating (124 mph)