Units

matter

twip

A typographic measure.

thou

An abbreviation of “thousandth of an inch”, also known as mi.

barleycorn

It’s the 1⁄3 of an inch.

inch

1 metre ≡ 39 47⁄127 inches.

hand

Used to measure the height of horses.

foot

Twelve inches.

yard

Defined as exactly 0.9144 m by the international yard and pound agreement of 1959.

chain

100 links, 4 rods, or 1⁄10 of a furlong, and the distance between the two wickets on a cricket pitch.

furlong

220 yards.

mile

1760 yards or 80 chains.

league

3 miles.

fathom

The British Admiralty in practice used a fathom of 6 ft. This was despite its being 1⁄1000 of a nautical mile (i.e. 6.08 ft) until the adoption of the international nautical mile.

cable

100 fathoms and one tenth of a nautical mile. Equal to 100 fathoms under the strict definition.

nautical mile

Used for measuring distances at sea (and also in aviation) and approximately equal to one arc minute of a great circle. Until the adoption of the international definition of 1852 m in 1970, the British nautical (Admiralty) mile was defined as 6080 ft.

link

1⁄100 of a chain and 1⁄1000 of a furlong.

rod

25 links. The rod is also called pole or perch and is equal to 5+1⁄2 yards.

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Source : Imperial units on Wikipédia.