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zar [Farsi, ذر] or dhar' [Farsi, ذرع]

In Persia and later Iran , 20ᵗʰ century, a unit of length. Both the metric zar = 1 meter and the previous zar, 1.04 meters were reportedly in use in 1995. Also romanized as dhar', and sometimes synonymous with the gaz.

As part of Persia’s adoption of the metric system, the gaz was made the name of the meter, sometime before 1924, and the law of 31 May 1926 refers to the meter as a gaz. Its previous value was 1.04 meters.

The square zar is based on the older zar; that is, it is 1.0816 square meters.¹

1. United Nations, 1966.

sources

The zar (yard) used in the bazars...39½ inches. The Imperial Persian zar...about 42 inches.

Persia. Report for the Year 1908-1909 on the Trade of the Provinces of Seistan and Kain.
No.4396 Annual Series, Diplomatic and Consular Reports.
London: H.M.S.O., 1910.
Page 4.