A datum is a plane, a straight line, or a point that is used as a reference when processing a material or measuring the dimensions of a target. ISO Definition. Types of Datums.

What is datum point?

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

What is an example of a datum point?

In engineering and drafting, a datum is a reference point, surface, or axis on an object against which measurements are made. ... A typical datum reference frame is made up of three planes. For example, the three planes could be one "face side" and two "datum edges".