are a form of beadwork used to count the Repetitions of prayers, chants, or mantras by members of various religions such as Hinduism, Buddhism, Shinto, Umbanda, Islam, Sikhism, the Baháʼí Faith, and some Christian denominations, such as the Roman Catholic Church, the Lutheran Church, the Oriental Orthodox Churches, and the Eastern Orthodox Churches. wikipedia 
Common forms of beaded devotion include the mequteria in Oriental Orthodox Christianity, the chotki in Eastern Orthodox Christianity, the Wreath of Christ in Lutheran Christianity, the Dominican rosary of the Blessed Virgin Mary in Roman Catholic Christianity, the dhikr (remembrance of God) in Islam, the japamala in Buddhism and Hinduism, and the Jaap Sahib in Sikhism.