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I have search on Google and never came across any idea how to enter this damn sign. would anyone give me some hint?

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You need UpTee:

UpTee[x, y] 

Mathematica graphics

or

x \[UpTee] y

or, using the input alias,

x ESC uT ESC y

x ⊥ y

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    $\begingroup$ If you're simply trying to reproduce the character in text (any document type), a useful resource is Wikipedia's List of Unicode characters. Interestingly, that document lists it as UpTack (alternatively falsum), but not UpTee as @kglr comments. Irregardless, you can locate it visually in their Mathematical Operators subsection: en.wikipedia.org/wiki/… $\endgroup$ – flith Nov 3 '16 at 9:16
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    $\begingroup$ UpTee?? But that's no fun. I've always wanted to say "There's the perp" $\endgroup$ – Daniel Lichtblau Nov 3 '16 at 16:52

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