Stilb (unit) meter. The current national standard for SI in the United States discourages the use of the stilb. formula_1 formula_2 formula_3 formula_4 formula_5 Other units of luminance: Stilb (unit) The stilb (sb) is the CGS unit of luminance for objects that are not self-luminous. It is equal to one candela per square centimeter or 10 nits (candelas per square meter). The name was coined by the French physicist André Blondel around 1920. It comes from the Greek word "stilbein" meaning "to glitter". It was in common use in Europe up to World War I. In North America self-explanatory terms such as
Spherical measure "r" > 0, where "A" denotes the “inflation” of "A" by "r", i.e. In particular, if "σ"("A") ≥ ½ and "n" ≥ 2, then Spherical measure In mathematics — specifically, in geometric measure theory — spherical measure "σ" is the “natural” Borel measure on the "n"-sphere S. Spherical measure is often normalized so that it is a probability measure on the sphere, i.e. so that "σ"(S) = 1. There are several ways to define spherical measure. One way is to use the usual “round” or “arclength” metric "ρ" on S; that is, for points "x" and "y" in S, "ρ"("x",