Source : Free On-Line Dictionary of Computing

Yet Another
     
         (YA-, after {Unix}'s {yacc} - Yet Another
        Compiler-Compiler) A humorous allusion often used in titles to
        acknowledge that the topic is not original, though the content
        is.  As in "Yet Another AI Group" or "Yet Another {Simulated
        Annealing} {Algorithm}".  If used of others' work, it
        describes something of which there are already far too many.
     
        In hackish acronyms the "YA" prefix almost invariably expands
        to {Yet Another}, e.g. {YABA}, {YAUN}.
     
        [{Jargon File}]
     
        (1996-11-26)