Polyplatonic is a form is form of non-monogamous relationship were you are capable of having quasiplatonic relationships with multiple people at once. Polyplatonic is identity is similar to Polyamory but instead of having romantic relationships with the other people involved, it's quasiplatonic relationships.
This label can be usually seen used by aro-spectrum people or others who are or prefer qpr. While polyamorous isn't inherently a romantic label it can be for some people be more comforting, an easy way to tell u aren't inherently a romantic polyamorous person or other reasons to use polyplatonic.
flag
Blue: To resemble the polyamoury flag but be easier on the eyes
Light Green: The opposite of red which is a romantic colour
Grey: To resemble the black on the polyamoury flag
Purple pi symbol: The opposite of the yellow pi symbol and also to contrast the green
Resources
https://www.deviantart.com/pride-flags/art/Polyplatonic-556890760