An arrangement of points with no three collinear, or of lines with no three concurrent.
General Position
See also
Concurrent, Ordinary Line, Near-PencilExplore with Wolfram|Alpha
References
Guy, R. K. "Unsolved Problems Come of Age." Amer. Math. Monthly 96, 903-909, 1989.Referenced on Wolfram|Alpha
General PositionCite this as:
Weisstein, Eric W. "General Position." From MathWorld--A Wolfram Resource. https://mathworld.wolfram.com/GeneralPosition.html