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The barleycorn is a small English unit of length equal to 1⁄3 of an inch (i.e., close to 0.8467 cm) still used in Great Britain and Ireland as a determiner of shoe sizes.
Megameter or megametre is a metric unit of length or distance. It is equal to 1 000 000 meters. Megametres are also occasionally found in science fiction. Plural name is megameters.