パーシヴァル・ローウェル
The final choice of name was helped in part by the fact that the first two letters of "Pluto" are the initials of Percival Lowell. Pluto's astronomical symbol Unicode U+2647, ♇) was then created as a monogram constructed from the letters "PL". Pluto's astrological symbol resembles that of Neptune , but has a circle in place of the middle prong of the trident .