It's a fathom, which equals 6 feet
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A man's outstretched arms typically measure around 5 to 6 feet in length, which is approximately equal to the wingspan of his body.
The word "fathom" comes from Old English "fæðm," meaning outstretched arms or a unit of length measuring the span of a person's outstretched arms. It later evolved to refer to a unit of measurement equaling six feet used for measuring the depth of water.
A fathom is a unit of imperial length which is used to measure the depth of water. I fathom is equivalent to 6feet or 1.83metres e.g. 3 fathoms = 18ft or 5.49m
The basic unit in the metric system for length is the meter.
By unit of length and distance and conversion ,we can say that base unit of length for the si system is m.
The SI unit for length is the meter (m).