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The up tack or falsum (?,
\bot in LaTeX, U+22A5 in Unicode) is a constant symbol used to represent:
as well as
The glyph of the up tack appears as an upside-down tee symbol, and as such is sometimes called eet (the word "tee" in reverse). Tee plays a complementary or dual role in many of these theories.
The similar-looking perpendicular symbol (?,
\perp in LaTeX, U+27C2 in Unicode) is a binary relation symbol used to represent: