Metric system
The metric system was a measuring system used by the replicators aboard Federation starships during the mid-24th century. (; )

On Earth, the metric system was one of the primary systems used, it was also used by other alien species including the Akaali, the Brekkians, the Ferengi, the Retellians, Tessic's species, the Xindi, and the Zibalians, among others. (, , )

When the Romulan Admiral Alidar Jarok, who defected to the  in 2366, he requested from the ship's replicator a  of water at the temperature of twelve onkians. The Enterprise computer was not familiar with that , and informed Jarok that "[t]his system is calibrated to the Celsius metric system." The clearly irritated Jarok then clarified, "[a]ny temperature at all on the cold side of whatever your system is." ()

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