Pluto's Symbol

Explanation: The symbols for the planets, Moon, and Sun (along with the symbols for the zodiac constellations) were developed for use in both astronomy and astrology. The symbol for Pluto is a monogram made up of the P and L in Pluto and also the initials of the astronomer, Percival Lowell, who predicted its discovery.

Pluto

Image credit: Lunar and Planetary Institute.