The phrase "Buddha hand" usually points to a mudra, a symbolic gesture used in Buddhist art and practice. These gestures communicate teaching, protection, meditation, generosity, or spiritual realization.
The open raised palm is often the abhaya mudra, meaning fearlessness or protection. A hand touching the earth is the bhumisparsha mudra, linked with the Buddha calling the earth to witness his enlightenment.
This is not palmistry. Nobody is reading lines on the Buddha's hand to predict his weekend. The hand itself is a visual language.
