Up tack
The up tack or falsum (⊥, codice_1 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 (⟂, codice_2 in LaTeX, U+27C2 in Unicode) is a binary relation symbol used to represent: The double tack up symbol (⫫, U+2AEB in Unicode) is a constant symbol used to represent: Up tack The