Also called: Line of the Moon · Linea Lunae · Cheiro's psychic line

Where on the hand: Starts low on the Mount of Luna near the percussion, arcs inward toward the Plain of Mars and then back out, and ends on or near the Mount of Mercury at the base of the little finger. It occupies broadly the same territory as the Mercury/Health line.

What it looks like: A distinct crescent or bow shape, concave toward the percussion. The curve is the whole distinguishing feature: the Health line is straight or wavy, the Intuition line describes a clean bow.

Intuitive faculty — the ability to form accurate judgements of people and situations without conscious reasoning. Subjects report they "feel it in their bones" rather than knowing why. It also carries sensitivity to atmospheres, presentiment, and vivid or prophetic dreams; in the Indian reading, antarjnan — inner knowing — and receptivity to subtle influence.

Western reading: Benham classes it as a curved variant of the Mercury line and makes its reading strictly conditional on hand type; Cheiro treats it as an independent psychic line.

Read with care: The island-at-the-start reading of "somnambulism and dissociative states" is a traditional claim, not a clinical one.