Source : WordNet®

Cu
     n : a ductile malleable reddish-brown corrosion-resistant
         diamagnetic metallic element; occurs in various minerals
         but is the only metal that occurs abundantly in large
         masses; used as an electrical and thermal conductor [syn:
          {copper}, {atomic number 29}]

Source : Free On-Line Dictionary of Computing

CU
     
         "see you".
     
        (1997-12-01)

cu
     
        1.  {Call Unix}.
     
        2.  The {country code} for Cuba.
     
        (1999-01-27)