Percival Lowell
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 .