The meaning of the Acronym UUD is...

UUD is

• Proton, two up quarks (u) and one down quark (d)

More Meanings For UUD:

• UUencode Decoded file archive ( ASCII)
• Proton, two up quarks (u) and one down quark (d)
• Ulan- Ude, Russia
• Ujung-Ujungnya Duit

UUD is also in:

• Airport Codes
• File Extensions
• Indonesian
• Physics