plural of saddle point

(geometry) A point in the range of a smooth function, every neighbourhood of which contains points on each side of its tangent plane.

plural of turning point

plural of starting point

plural of datum point

A point which serves as a reference or base for the measurement of other quantities.

plural of point of order

(politics) A motion calling attention to a breach of order of the rules.

plural of reference point

plural of point mass