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the 'Not' sign..
signifies a negative and opposite.

you are ¬cool.
by Khoo September 18, 2003
One of the least used symbols on the keyboard.
When did you last press the ¬ key? Come on, seriously... have you ever pressed it at all except once to see what it did?
by Bob Gurch August 26, 2004
Seriously? You looked up ¬? What are you doing?
You know that you are bored when you search for ¬ on urban dictionary.
by allthedecentnameshavebeenused September 06, 2014