Knotted wool wrist chotki chaplet Rosary with Wooden Bead engraved with Crosses (33 Knots) Black wool knotted wrist chotki used by Monks (Orthodox or Eastern Catholics). It is not elastic but will stretch a bit to distance each knot from the next. These Rosaries asre used by Eastern Orthodox Christians and Eastern Rite Catholics to count the number of times they have prayed the Jesus Prayer: "Lord Jesus Christ, son of God, have mercy on me, a sinner." Historically it typically had 100 knots, although prayer ropes with 50 or 33 knots can also be found in use today. Its invention is attributed to Saint Pachomius in the fourth century as an aid for illiterate monks to accomplish a consistent number of prayers and prostrations. Monks were often expected to carry a prayer rope almost constantly, to remind them to pray constantly in accordance with Saint Paul's injunction in I Thessalonians 5:17, "Pray without ceasing."