An "overdot" is a raised dot appearing above a symbol most commonly used in mathematics to indicate a derivative taken with respect to time (e.g., ). The expression is voiced " dot," and was Newton's notation for derivatives (which he called "fluxions").

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

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