Rosary Ring

During World War I, soldiers would use rosary ring as a simplified version of a full rosary.  It is could be described as an early version of a fidget spinner, where the user would spin the ring on their finger and say a prayer as they touched each bump on the outside of the ring.  A Hail Mary would be said when each of the ten oblong bumps was touched and an Our Father is said when the cross is touched.