ていろんせき 否定論理積
1. non-conjunction; NAND operation; NOT-BOTH operationComputer terminology
Wikipedia definition
2. Sheffer strokeIn Boolean functions and propositional calculus, the Sheffer stroke, named after Henry M. Sheffer, written "|" (see vertical bar, not to be confused with "||" which is often used to represent disjunction), "Dpq", or "↑", denotes a logical operation that is equivalent to the negation of the conjunction operation, expressed in ordinary language as "not both". It is also called the alternative denial, since it says in effect that at least one of its operands is false.
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