The meaning of the Acronym U is...

U is

• Uncompromising
• Unsigned
• Urgent

More Meanings For U:

• Uranium
• Undetectable
• designation for an integrated circuit
• Micro-
• Micro-
• Upsilon
• University
• Undecided
• Uncertain
• Uninterpretable
• Micro-
• Unexcelled
• Unsatisfactory
• Undergraduate
• Unlimited

U is also in:

• Chemistry
• Electronics
• General
• Mathematics
• Meteorology
• Physics
• Universities