Divination of fingernails: Onyomancy is the fortune-telling using the reflection of bright sunlight on a person’s fingernails and noting any symbols (real or imaginary) that might appear there.

Onymancy is a method of future predictions by observing fingernails or olive oil on the fingernails of an “unpolluted boy” or a young female virgin.

These symbols are interpreted in accordance with established rules, as with crystal gazing or teacup reading.