The symbol used to denote similarity, equivalence relations, or asymptosy.
Swung Dash
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References
Bringhurst, R. The Elements of Typographic Style, 2nd ed. Point Roberts, WA: Hartley and Marks, p. 285, 1997.Referenced on Wolfram|Alpha
Swung DashCite this as:
Weisstein, Eric W. "Swung Dash." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/SwungDash.html