Since collinear is points that lie on the same line, and you need two points to form a line so those 2 points are collinear. So the opposite of that is noncollinear.
You have to have three or more points to have non-colinear points because any two points determine a line. Noncolinear are NOT on the same line.
3 or more
what is noncollinear because it was a point
The shape identified by three noncollinear points.
Any Euclidean plane has infinitely many points.