What does "!" mean in pseudo-code? I know "!" stands for factorial but I can't translate it

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Published on 2010-03-16T22:56:30Z Indexed on 2010/03/16 23:01 UTC
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pseudocode

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operators

What does ! mean in pseudo-code? I know ! stands for factorial but I can't translate it .

ex:

get operation

if (operation!= ’B’ OR operation != ’D’ OR operation!= ’W’) then
    print "Invalid Operation"

What does it mean? Please help my mid-term is in hours :S

Thanks in advance for your help :)

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