The ConScript Unicode Registry is a volunteer project to coordinate the assignment of code points in the Unicode Private Use Areas (PUA) for the encoding of artificial scripts, such as those for constructed languages.[1] It was founded by John Cowan and was maintained by him and Michael Everson. It is not affiliated with the Unicode Consortium.[2]
As an example, see the ConScript Unicode Registry—a private group unaffiliated with the Unicode Consortium—which has extensive tables listing private-use character definitions for various unencoded scripts.