User Datagram Protocol 
Unitary Development Plan 
Usenet Death Penalty 
Unit Deployment Program 
Universal Datagram Protocol 
Ulster Democratic Party 
Unacknowledged Datagram Protocol 
Unit Deployment Packages 
User Development Program 
Ultradispersed Diamond Powder 
undegradable protein 
undegraded protein 
Under Drive Pully 
Undergraduate Degree Program 
Uniform Distribution Pattern 
unilateral diaphragmatic paralysis 
unintentional dural puncture 
Unit Deployment Plan 
United Data Processing 
United Democratic Party 
Universal Data Protocol 
University Distinguished Professor 
up-and-down procedure 
Update and Development Program 
uridine 5'-diphosphate 
Uridine 5'-diphospho 
uridine diphosphate 
uridine diphospho 
uridine phosphorylase 
uridyl diphosphate