Source : Webster's Revised Unabridged Dictionary (1913)

Mascot \Mas"cot\, Mascotte \Mas"cotte\, n. [Through French fr.
   Pr. mascot a little sorcerer or magician, mascotto
   witchcraft, sorcery.]
   A person who is supposed to bring good luck to the household
   to which he or she belongs; anything that brings good luck.

Source : WordNet®

mascot
     n : a person or animal that is adopted by a team or other group
         as a symbolic figure

Source : Free On-Line Dictionary of Computing

MASCOT
     
        Modular Approach to Software Construction Operation and Test:
        a method for software design aimed at real-time embedded
        systems from the Royal Signals and Research Establishment, UK.