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Glossary of mathematical symbols
Vertical bar - Wikipedia ... Vertical bar
Triple bar - Wikipedia ... Triple bar
Mathematical notation
middle dot (for multiplication) 1698 (perhaps deriving from a much earlier use of middle dot to separate juxtaposed numbers) ⁄. division slash (a.k.a. solidus) 1718 (deriving from horizontal fraction bar, invented by Abu Bakr al-Hassar in the 12th century) Thomas Twining. ≠.
List of logic symbols
Mathematical operators and symbols in Unicode
Greek letters used in mathematics, science, and engineering