 Pluto, like Uranus, has multiple symbols in use.One symbol, ♇, is a monogram of the letters PL (which can be interpreted to stand for Pluto or for astronomer Percival Lowell), was announced with the name of the new planet by the discoverers on May 1, 1930.Another symbol, which was popularized in Paul Clancy's astrological publications, is based on the symbol for Mercury, with the circle and arc of Mercury trading positions.