Zebra - a unit of volume, is mentioned in the Ipatiev Chronicle under 1294 in a prince's letter of punishment for Berestians, on which "5 zebras of rye, 5 zebras of oats" were imposed from one hundred. In the dictionary of the Memory of Berynda, zebras are recognized as a bucket , Polish zebras are 26-30 quarts .
Sources
Zebra // Brockhaus and Efron Encyclopedic Dictionary : in 86 volumes (82 volumes and 4 additional). - SPb. , 1890-1907.