nit

(optics) A unit of luminance, equal to 1 candela per square centimeter. Abbreviated sb.

A measurement of luminance. One nit is equal to one candela per square meter (1cd/m2). Ten thousand nits are equal to one stilb. See candela.

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[Etymology: Gk ‘glitter’] luminous emission. Symbol sb. Metric-c.g.s. 1921 For a diffuser, identically candela per square centimetre
[Moon P. J. Opt. Soc. Amer. Vol. 32, 348-62 (1942)] (cd·cm^-2 = 10^-4 cd·m^-2). (There was no corresponding unit in m.k.s., and there are no special units for luminous emission in the SI.) For a perfect diffuser, 1 sb corresponds to the emission of π cd·sr·cm^-2 = 3.141 6~ lambert. The millistilb (msb) was more common than the stilb. (The light of a clear sky at ground level ≈ 1 sb.)

A unit of luminance equal to 1 candela per sq cm. Abbr. sb. The use of this term is deprecated.