# datum reference

> feature of reference (point, line, plane, hole, set of holes, or pair of surfaces) against which some others are calculated

**Wikidata**: [Q1047519](https://www.wikidata.org/wiki/Q1047519)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Datum_reference)  
**Source**: https://4ort.xyz/entity/datum-reference