Apostilb
Apostilbes is a traditional unit of luminance self-luminous body and is no longer valid since 1978 as an official unit. It is a subunit of the Stilb. As an alternative name for this unit, the Blondel 1942 was proposed.
- Unit characters asb
1 asb = 1 / π · sb
3.14 asb = 1 cd / m²
The corresponding SI unit is cd / m².