The 3 sides of the icon are three creatures which are: Changelings & Centaurs & Chess. And then they work together to form the Legion Of Neutrality. Because they can fit each other.

LORE: This legion is the family crest of the legion. And it contains 5 creatures that can be in the family. The top and ponies with checkered cutie marks and ponies with pirate cutie marks. Right are centaurs and gargoyles. Left are the changelings.