The tee (⊤,
\top in LaTeX) also called down tack (as opposed to the up tack) or verum is a symbol used to represent:
A similar-looking superscript T may be used to mean the transpose of a matrix.
In Unicode, the tee character is encoded as U+22A4 ⊤ DOWN TACK (HTML
⊤, ⊤). The symbol is encoded in LaTeX as
A large variant is encoded as U+27D9 ⟙ LARGE DOWN TACK (HTML
⟙) in the Unicode block Miscellaneous Mathematical Symbols-A.