Classical palmistry named the fleshy pad at the base of the palm on the little-finger side the mount of Luna, after the Roman moon goddess. Luna was associated with imagination, the subconscious, creativity, and — in the more enthusiastic interpretations — psychic sensitivity. A well-developed mount was considered a sign that its owner lived as much in their inner world as the outer one.
The witch's mark, as the internet calls it, typically refers to a crescent-shaped line or marking on this mount, or sometimes to the intuition line — a curved line running from the mount of Luna upward toward Mercury (the little finger). Classical palmists interpreted the intuition line as a sign of strong gut instinct, vivid dreaming, and a tendency to know things without quite being able to explain how.
The "witch" label is, like the "billionaire line," a modern flourish. It makes for a better story. And in fairness, "your intuition line suggests heightened sensitivity" does sound considerably less interesting than "you have the witch's mark."



