CrAT

A crat is a unit of volume, most commonly referring to the krat, a dry measure used in ancient Greece. The size of a krat varied by region and time period, but it was generally equivalent to about 4.1 to 4.5 liters. It was used for measuring grain, wine, and other dry goods. The krat was further divided into smaller units such as the choenix and the kylix. Its precise dimensions are not known with certainty due to the scarcity of surviving artifacts and textual evidence.

The term "crat" can also appear as a prefix or suffix in other contexts. For instance, in chemistry, "crat" might be part of a chemical name or a unit related to concentration, though it is not a standard SI prefix. In casual speech, "crat" is sometimes used as a shortened form of "automaton," referring to a robot or mechanical device, particularly in science fiction contexts. However, this usage is informal and not recognized in formal scientific or engineering terminology. The ancient Greek krat remains the most recognized and historically significant meaning of the term.