The up tack or falsum (⊥, \bot in LaTeX, U+22A5 in Unicode[1]) 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).
[citation needed] 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: The double tack up symbol (⫫, U+2AEB in Unicode[1]) is a binary relation symbol used to represent: