Source : WordNet®

exclamation mark
     n : a punctuation mark (!) used after an exclamation [syn: {exclamation
         point}]

Source : Free On-Line Dictionary of Computing

exclamation mark
     
         The character "!" with {ASCII} code 33.
     
        Common names: {bang}; pling; excl (/eks'kl/); shriek; {ITU-T}:
        exclamation mark, exclamation point (US).  Rare: {factorial};
        exclam; smash; cuss; boing; yell; wow; hey; wham; eureka;
        soldier; {INTERCAL}: spark-spot.
     
        The {Commonwealth Hackish}, "pling", is common among {Acorn
        Archimedes} owners.  {Bang} is more common in the USA.
     
        The occasional {CMU} usage, "shriek", is also used by {APL}
        fans and mathematicians, especially {category} theorists.
     
        Exclamation mark is used in {C} and elsewhere as the logical
        negation {operation} ({NOT}).
     
        (1998-09-17)