GL F IIA2.4 Units and names of units permitted in specialised fields only

Quantity
Unit
Name

Symbol

Value
Vergency of optical systems
Dioptre
 
1 dioptre = 1 m-1
Mass of precious stones
metric carat
 
1 metric carat = 2 x 10-4 kg
Area of farmland and building land
are
a
1 a = 102 m2
Mass per unit length of textile yarns and threads
tex
tex
1 tex = 10-6 kg.m-1
Blood pressure and pressure of other body fluids
millimetre of mercury
mm Hg
1 mm Hg = 133,322 Pa
Effective cross-sectional area
Barn
b
1b = 10-28 m2
 
The prefixes and their symbols listed in F‑II, Annex 21.3 may be used in conjunction with the above units and symbols, with the exception of the millimetre of mercury and its symbol. The multiple of 102 a is, however, called a "hectare".

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EPO Guidelines - F The European Patent Application