The "heart line" is a term used in palmistry, which is the practice of interpreting the lines on a person's palm to gain insights into their personality and life experiences. The heart line is typically found at the top of the palm, running horizontally beneath the fingers. It is believed to represent emotions, relationships, and matters of the heart. In palmistry, the characteristics of the heart line, such as its length, depth, and curvature, can indicate different emotional traits. For example, a long and deep heart line may suggest a person who is open and expressive in their feelings, while a short or faint line might indicate a more reserved emotional nature.