A local extremum, also called a relative extremum, is a local minimum or local maximum.
Local Extremum
See also
Extremum, Global Extremum, Local Maximum, Local MinimumExplore with Wolfram|Alpha
Cite this as:
Weisstein, Eric W. "Local Extremum." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/LocalExtremum.html