The Limbu script is a Brahmi-derived writing system primarily used to write the Limbu language. The language is used in parts of eastern Nepal and the neighboring Indian states of Sikkim and West Bengal (in the Darjeeling district). The script is also known as Kirat, Kirant, Kiranti, and Sirijonga.
The Unicode implementation of Limbu is described in chapter 10 (South Asian Scripts - II) of The Unicode Standard, Version 5.0.
Names, images, properties and additional background/non-technical information about the Limbu Unicode block and its characters can be found on decodeunicode's Limbu block page (in English and German/Deutsch).