|≈||approximately equal to|
|digits||indicates that digits repeat infinitely (e.g. 8.294 369 corresponds to 8.294 369 369 369 369 …)|
An zeptometer is a unit of length, a combination of the metric prefix zepto (symbol z) and the SI unit of length meter (symbol m), equal to 10−21 meter or 1.0E-21 meter and its symbol is zm. Plural name is zeptometers.
A cable length or length of cable is a nautical unit of measure equal to one tenth of a nautical mile or approximately 100 fathoms. The unit is named after the length of a ship's anchor cable in the Age of Sail. The definition varies: