A fixed point for which the stability matrix has equal nonzero eigenvalues and two linearly independent eigenvectors.
Fixed Point Star
See also
Stable Star, Unstable StarExplore with Wolfram|Alpha
Cite this as:
Weisstein, Eric W. "Fixed Point Star." From MathWorld--A Wolfram Resource. https://mathworld.wolfram.com/FixedPointStar.html