Английская Википедия:Brewster (unit)
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The brewster (B) is a non-SI unit used to measure the susceptibility of a material to photoelasticity, or the value of the stress-optic coefficient of the material. The unit has dimensions reciprocal to those of stress. One brewster is defined to be equal to <math>10^{-12}</math> square metres per newton (m2/N or 1/Pa) or <math>10^{-13}</math> square centimetres per dyne (cm2/dyn).[1] The unit is named after David Brewster, who discovered stress-induced birefringence in 1816.
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