In Japan, 20ᵗʰ century, a unit of length = 6 shaku, approximately 1¹⁷⁄₃₃ (i.e., ⁵⁰⁄₃₃ or 1.515…) meters (about 4.97 feet). Like the fathom in present-day English, it is mainly used to describe water depths.
United Nations, 1966.
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Last revised: 8 May 2001.