User blog comment:A, Mori/Species Symbols/@comment-3126873-20141017222656/@comment-16075172-20141018141352

I'm pretty sure that in other renderings of characters aside from SFANB that they've shown use of the symbols. There's also that the RPG abilities show their symbols. There's also connection to some items that are used by the characters that are literally their symbols.

Also, Samuel agreed that the Splationian thing would be canon for them.