An underscore is a horizontal line placed under a symbol to indicate some special property. Underscores are sometimes used instead of over-arrows or bold typeface to indicate a vector, for example .

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References

Bringhurst, R. The Elements of Typographic Style, 2nd ed. Point Roberts, WA: Hartley and Marks, p. 286, 1997.

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Underscore

Cite this as:

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

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