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Octothorpe


The number sign # sometimes used in mathematics to indicate the number of a quantity satisfying some condition, e.g., #{n:n>1}. The symbol is also used to denote a primorial.


See also

Number

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References

Bringhurst, R. The Elements of Typographic Style, 2nd ed. Point Roberts, WA: Hartley and Marks, p. 282, 1997.

Referenced on Wolfram|Alpha

Octothorpe

Cite this as:

Weisstein, Eric W. "Octothorpe." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/Octothorpe.html

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