Which of these is used in many religions to mark the repetitions of prayers, chants or devotions?

Prayer beads are used by members of various religious traditions such as Hinduism, Buddhism, Christianity, Islam, Sikhism and the Bahá'í Faith to mark the repetitions of prayers, chants or devotions, such as the rosary of the Blessed Virgin Mary in Catholicism, and dhikr (remembrance of God) in Islam.

The number of beads varies by religion or use. Islamic prayer beads, called Misbaha or Tasbih, usually have 100 beads (99 +1 = 100 beads in total or 33 beads read thrice and +1. Buddhists and Hindus use the Japa Mala, which usually has 108 beads, or 27 which are counted four times. Baha'i prayer beads consist of either 95 beads or 19 beads, which are strung with the addition of five beads below. The Sikh Mala also has 108 beads.

Roman Catholics use the Rosary (Latin "rosarium", meaning "rose garden") with 59 beads. However, Eastern Orthodox Christians use a knotted prayer rope called either a komboskini or chotki, with 100 knots, although prayer ropes with 50 or 33 knots can also be used.