emoji: In Code page 437, the original character set of the IBM PC, the value of 3 (hexadecimal 03) represents the heart symbol. This value is shared with the non-printing ETX control character, which overrides the glyph in many contexts. Parametrisation A number of parametrisations of approximately heart-shaped curves have been described. The best-known of these is the cardioid, which is an epicycloid with one cusp; though as the cardioid lacks the point, it may be seen as a stylized water-lily leaf, a so-called seeblatt, rather than a heart. Other curves, such as the implicit curve (x2+y2−1)3−x2y3=0, may produce better approximations of the heart shape. See also Cordata, Cordatum and Cordatus, Latin adjectives meaning heart-shaped Passion (emotion), or passionate love Seeblatt, a symbol of a water lily leaf that resembles a heart References Inline citations Works cited Martin Kemp, "The Heart" in Christ to Coke: How Image Becomes Icon, Oxford University Press, 2011, 81–113. General references External links 15th-century introductions Heraldic charges Late Middle Ages Pictograms Romance Symbols Love