VERUM
The tee (⊤, \top in LaTeX), also called down tack (as opposed to the up tack) or verum, is a symbol used to represent:
The top element in lattice theory.
The truth value of being true in logic, or a sentence (e.g., formula in propositional calculus) which is unconditionally true. By definition, every tautology is logically equivalent to the verum.
The top type in type theory.
Mixed radix encoding in the APL programming language.
A lowered phonic in the International Phonetic Alphabet and phonetics. In this usage, it is usually written under the primary IPA symbol.
A similar-looking superscript T may be used to mean the transpose of a matrix.
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