There specific role in the game is still unknown, but five factions have been found through various sources. [url=http://destinypedia.wikia.com/wiki/Speculation#Storyline]Source[/url]

But isn't "fact" the root word of "faction???" I'm so confused.

A few of those images have been around for a hot minute. The eye one is an old popular emblem for H3, FWC originates from the MLG crowd, and the others I've seen elsewhere. The only one that seems newer is the one with the 7 in it.

we know they are factions