Nits; cd/m^2
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Nits or cd/m^2 is a way to express the luminance or brightness of a light source over an area. It is often used in the display industry, and less in the lighting industry.
However, the term is useful when describing OLEDs because they are uniform, surface emitters. The base unit is the candela (cd), which describes brightness to a specific point, traditionally the human eye, but now defined scientifically. Originally referred to as candlepower, or foot-candle, it has been updated over time.
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