datums

Datums is a plural of datum, used in technical fields where individual data points matter.

In surveying and cartography, datums are reference frameworks for measuring positions: The two maps use different datums, so the coordinates don't align.

In engineering, a datum is a reference surface from which measurements are taken.

The Latin plural data has largely replaced datums in general usage, but datums persists in specialized contexts where precision about multiple reference systems matters.