Panplatonic refers to someone who regularly feels platonic attraction towards people regardless of gender. It is the platonic equivalent of pansexual.
Panplatonic does not refer to someone who simply "has friends of multiple genders" or "is capable of being friends with people of any gender", rather it describes someone who regularly experiences squishes or "friend crushes" or otherwise feels a strong desire to be friends with someone in particular.
Flag
The panplatonic flag was designed by Disneyfan1413 and was posted on July 15, 2020.[1] The flag uses the pansexual flag with a faded diamond. It was chosen because a faded heart is usually used for romantic attraction flags. The choice of a diamond is potentially in reference to the concept moirails (a form of strong platonic relationship) from Homestuck.
Another panplatonic flag was created by an anonymous submitter to beyond-mogai-pride-flags on July 31, 2017.[2] This flag was has no known meaning.