Onychomancy

Onychomancy or variously onuchomancy, onychomantia, onycomancy, onymancy (from Greek onychos, 'fingernail', and manteia, 'fortune-telling') is an ancient form of divination using fingernails. It consists of watching the reflection of sunlight on the oiled fingernails of an unpolluted boy, then interpreting the symbols that appear.