||unmanned air vehicle
||This is the future the air force whether they want to admit it or not.
||uniform circular array
||One way to group antennas into an array.
||As in, a phone in a mobile network. Or the Unknown Editor.
||uniform grid array
||Another way to group antennas into an array.
||uniform linear array
||Yet another way to group antennas into an array.
||unit under test
||See device under test.
||A test failure that occurred once but won't repeat, so you can't determine its cause. In the satellite business, any hardware with a UVF can't be launched without approval from the Chief Engineer, Customer, and insurance company.