🌐فارسیEnglishEspañolРусскийالعربيةفارسیEntityQ1047519· pop 8· linked from 33 articlesمرجع مبناAlso known as datumfeature of reference (point, line, plane, hole, set of holes, or pair of surfaces) against which some others are calculatedAvailable in 8 languagesРусскийالعربيةBasqueKazakhNorwegianUkrainianفارسیvia Wikidata sitelinks · CC0Connectionsgeodetic reference systemEntitygeometric dimensioning and tolerancingEntityCategoriesCoordinate systemsGeometry