You searched for: “dactyliomancy
dactyliomancy, dactylomancy, dactyomancy (s) (noun) (no pl)
Divination with finger rings: Dactyliomancy is said to work “. . . by holding a ring suspended by a fine thread over a round table on the edge of which were a number of marks with the 24 [Greek] letters of the alphabet. The ring was consecrated with a great deal of mystery.”