U Business & Finance Abbreviation

Unknown

A code meaning "information not available. An unidentified target. An aircraft or ship that has not been determined to be hostile, friendly, or neutral using identification friend or foe and other techniques, but that must be tracked by air defense or naval engagement systems.

Uranium Participation Corporation

Unit

It is a definite magnitude of a physical quantity. The identifier for a logical subsystem and the logical device within the subsystem. In mainframe computing, the address associated with a device on a given control unit. On ESCON or FICON interfaces, the unit address is the same as the device address. On OEMI interfaces, the unit address specifies a control unit and device pair on the interface. The address of a particular device, specified at the time a system is installed.

University

Universal

Upward

Upsilon

Unconditional

Update(d) (action code)