Abrevieri
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UART Universal asynchronous receiver transmitter
mH micro Henries
mH/m micro Henries per metre
U 19inch rack, Height unit, (1.75 inch / 44.45mm)
u.h.f. Ultra high frequency (approx. 470-854MHz)
u.j.t. Unijunction transistor
UF Urea Formaldehyde
UL Underwriters Laboratory
ULA Uncommitted logic array
UNC Unified National Coarse (thread)
UNF Unified National Fine (thread)
USB Universal Serial Bus
UTP Unscreened Twisted Pair cable
UV Ultra Violet