What is "janbuk"

Janbuk (, also Romanized as Janbūk and Janbook; also known as Chambūk, Chanbūk, Jambūk, Jonbūd, and Junbūk) is a village in Khusf Rural District, Central District, Khusf County, South Khorasan Province, Iran. At the 2006 census, its existence was noted, but its population was not reported.