Onychomancy
Onychomancy or onymancy (from Greek onychos, 'fingernail', and manteia, 'fortune-telling') is an ancient form of divination using fingernails as a "crystal ball" or "scrying mirror" and is considered a subdivision of palmistry (also called chiromancy). As with palmistry, the contradictions between different interpretations and the lack of evidence for the predictions have led onychomancy to be viewed as a pseudoscience by academics.