The meaning of the Acronym U is...

U is

• Micro-
• Upsilon

More Meanings For U:

• Unconditional
• Up
• Subsampled raw YUV file Bitmap graphics
• Update
• Undefined
• User
• Unicode
• Users
• Unwind tape
• designation for an integrated circuit
• Userid
• Unlocked
• You
• Uninstall
• Uranium

U is also in:

• Assembly
• Chemistry
• File Extensions
• General
• Hardware
• Security
• SMS
• Software