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").
Overdot
See also
Derivative, Dot, Double DotExplore with Wolfram|Alpha
References
Bringhurst, R. The Elements of Typographic Style, 2nd ed. Point Roberts, WA: Hartley and Marks, p. 282, 1997.Referenced on Wolfram|Alpha
OverdotCite this as:
Weisstein, Eric W. "Overdot." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/Overdot.html