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GeezerVison is showing mathworld.wolfram.com — Dagger -- from Wolfram MathWorld

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Dagger

The symbol | most commonly used to denote the adjoint operator. The dagger is also known as the obelisk, obelus, or long cross (Bringhurst 1997, p. 275).

See also

Adjoint Operator, Double Dagger

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References

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

Referenced on Wolfram|Alpha

Dagger

Cite this as:

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

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