We'd like to use analytics cookies to understand which symbols people look up, so we know what to research next. They are not used for advertising and we set none of them unless you say yes. What we store.
A horizontal bar with a short downward tick at its right end, denoting logical not.
Also known as: Not sign, Backwards L, Line with a hook
¬ denotes logical negation: it reverses the truth of the statement that follows. Several other notations compete with it — a tilde, a bar over the expression, an exclamation mark in programming — and none has displaced the others.
Is encoded as U+00AC NOT SIGN, in the Latin-1 Supplement block rather than among the mathematical operators.
Contexts: Mathematics
Denotes negation: the statement it precedes is asserted to be false.
Contexts: Mathematics
Competes with several other notations for the same operation — a tilde before the statement, a bar drawn over it, and an exclamation mark in most programming languages — none of which has displaced the others.
Contexts: Mathematics
A horizontal bar drawn at mid-height with a short vertical stroke descending from its right-hand end, forming a reversed and rotated L.