| UHF | Ultra High Frequency, 300 MHz - 3 GHz |
|---|---|
| UIT | Union Internationale des Télécommunications |
| UK SA | UK Space Agency |
| UN | United Nations |
| UNOOSA | United Nations Office for Outer Space Affairs |
| USML | United States Munitions List |
| VHF | Very High Frequency, 30 MHz - 300 MHz |