A pair of overdots placed over a symbol, as in , most commonly used to denote a second derivative with respect to time, i.e., .

# Double Dot

## See also

Overdot## Explore with Wolfram|Alpha

## Cite this as:

Weisstein, Eric W. "Double Dot." From
*MathWorld*--A Wolfram Web Resource. https://mathworld.wolfram.com/DoubleDot.html