List of non-coherent units of measurement
Wikimedia list article
This is a list of units of measurement in active use, which do not form part of a coherent system of measurement. Many of the items listed here are colloquial units based on familiar objects such as parts of the body. Many of the listed units are approximate or vaguely defined. Some are odd multiples or fractions of a base unit.
Length
Ligne
The ligne is a French unit of length that is sometimes used in watchmaking and ribbon manufacture. It is equal to one twelfth of a Paris inch, or about 2.2558 mm.
Diameters of buttons are also measured in a unit called the ligne, but it is defined as 1/40 inch.
Vee
In groff/troff and specifically in the included traditional manuscript macro set ms, the vee (v) is a unit of vertical distance often—but not always—corresponding to the height of an ordinary line of text.
Horizontal pitch
Horizontal pitch (HP) is a unit of length defined by the Eurocard printed circuit board standard used to measure the horizontal width of rack-mounted electronic equipment, similar to the rack unit (U) used to measure vertical heights of rack-mounted equipment. One HP is 0.2 inches (1⁄5″) or 5.08 millimetres wide.
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