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#### angstrom

Or ångström, is a unit of length (symbol Å) , also called tenthmeter, which is named after Swedish spectroscopist Ander Jonas Ångström. It is equal to 10-10 meter or 0.1 nanometer.

#### bicron

An obsolete metric unit of length, defined as 10-12 meter or 10-6 micron. This length is now called a picometer (pm).

#### cable

A nautical unit to measure the distance. One cable is one tenth of nautical mile or 100 fathoms.The length of a cable in UK and International use is slightly different for the difference of the nautical mile. One cable is 185.3 meters in UK and 185.2 meters in International use.

#### chain

A unit of length used in UK, US and other Commonwealth countries (symbol ch). 1 chain = 4 rod =20.1168 meter.

#### fathom

A nautical unit to measure the depth of sea water. Now it can also be used to measure the depth of mines. 1 fathom = 2 yards = 6 feet.

Unit of length based on foot, pound and second (symbol ft). Historically, there were a few definitions in different countries. Internationally, 1 foot = 0.3048 meters = 12 inches.

#### furlong

A unit of length based on the inch, foot, yard, and mile system. 1 furlong = 40 rods.

#### hand

A traditional unit of distance, now used mostly to measure the height of horses. One hand equals 4 inches, 1/3 foot, or 10.16 centimeters.

#### inch

Unit of length based on foot, pound and second (symbol in). Historically, there were a few definitions in different countries. Internationally, 1 inch = 0.0254 meter = 1/12 foot.

#### league

A traditional unit of distance was intended to express one hour of walk. It was usually three times of a mile, i.e. 3 statute miles (4828.032 meters) on land, 3 nautical miles at sea (5556 meters in US and 5559 meters in UK for the slight difference of nautical miles).

A unit of length based on the inch, foot, yard, and mile system (symbol li). 1 link = 33⁄50 feet = 7.92 inches.

#### meter

SI base unit of length. Meter is the length of the path traveled by light in a vacuum during a time interval of 1/299792458 of a second. This definition was adopted in 1983 by the CGPM.

#### mil

A unit of length in the US Customary System equal to 1/1000 of an inch, used chiefly to measure the diameter of wires.

#### nautical mile

A nautical mile (symbol nmi) is the angular distance of one minute (1/60 degree) of latitute on the earth surface. The distance varies with the difference of latitute. For many years the British adopted 6080 feet as one nautical mile (1853 meters). Until 1929 the nautical mile was adopted by the First International Extraordingary Hydrographic Conference to be 1852 meters exactly or 6076.115 49 feet. The international nautical mile equals about 1.1508 statute miles.

#### rod

A unit of length based on the inch, foot, yard, and mile system (symbol rd). 1 rod = 25 links.

#### shackle

A nautical unit of length. 1 shackle = 15 fathoms = 27.432 metrers.

#### statute mile

The statute mile (symbol mi) is an English unit of distance as measured on land. One statute mile is 5280 feet or 1760 yards, which is about 1,609 metres. The mile used at sea is nautical mile.

#### yard

A unit of length based on the inch, foot, yard, and mile system (symbol yd). 1 yard = 3 feet =0.9144 meter.

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