Datum is, from its Latin origin, a singular form of "data", and may refer to a single item of data.

Look up datum in Wiktionary, the free dictionary.

• Geodetic datum, a standard position or level that measurements are taken from in geographic surveying
• Datum reference, in carpentry, metalworking, needlework, geometric dimensioning and tolerancing
• Chart datum, level of water depth on a nautical chart
• Datum or datum point, a (possibly arbitrary) reference baseline or point from which scientific measurements are made (from a Latin meaning of datum as a "given", i.e. an accepted fact)

• Datum (magazine), an Austrian monthly magazine
• Omne Datum Optimum ("Every perfect gift"), a papal bull issued by Pope Innocent II in 1139 endorsing the Knights Templar

• Datum Peak, New Zealand
• Datum (Greece), a city in ancient Macedonia

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