Mmm not sure but I know seeing’s P on our screens mean theirs a product showing in the programme like cornflakes or something else
Love your user name by the way ...Kitty Glitter, love that , lol
The only symbol that I can think of is the one that they've been using since the programme begin, which is the letter 'Q', fashioned to look like a magnifying glass, with the letter 'i' inside it.
"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."