DuckCorp Dico

Found one definition

1.                 From The Jargon File (version 4.4.7, 29 Dec 2003):
                   
   
   
                   
                     
   quad
    n.
       1. Two bits; syn. for quarter, crumb, tayste.
       2. A four-pack of anything (compare hex, sense 2).
       3. The rectangle or box glyph used in the APL language for various arcane
       purposes mostly related to I/O. Former Ivy-Leaguers and Oxford types are
       said to associate it with nostalgic memories of dear old University.