sheffers stroke

World English Dictionary
Sheffer's stroke
logic a function of two sentences, equivalent to the negation of their conjunction, and written p|q (p and q are both not true) where p,q, are the arguments: p|q is false only when p,q are both true. It is possible to construct all truth functions out of this one alone
[named after H. M. Sheffer (1883--1964), US philosopher]

Collins English Dictionary - Complete & Unabridged 10th Edition
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