Units of length | Customary units of measurement in the United States
Link (unit)
The link (usually abbreviated as "l.", "li." or "lnk."), sometimes called a Gunter’s link, is a unit of length formerly used in many English-speaking countries. In US customary units modern definition, the link is exactly 66⁄100 of a US survey foot, or exactly 7.92 inches or approximately 20.12 cm. The unit is based on Gunter's chain, a metal chain 66 feet long with 100 links, that was formerly used in land surveying. Even after the original tool was replaced by later instruments of higher precision, the unit was commonly used throughout the English-speaking world, for example in the United States customary units and the Imperial system. The length of the foot, and hence the link, varied slightly from place to place and time to time. In modern times the difference between the US survey foot and the international foot is two parts per million. The link fell out of general use in the 20th century. (Wikipedia).
