It Represents People

In Green Lantern: Emeral Warriors #4, Sodam Yat rebelled against the Guardians of the Universe, taking his Daxamite followers and planning to start up his own Corps . . . or take over the existing one after ousting the little blue fellas in charge.

His rebellion comes complete with a change of symbol:

Isn't that a lovely ideal? To represent "Everyone -- in every corner of this universe."

People like these:

and these:

and these:

and not forgetting these guys:

Yep, that's what you need - a symbol to represent all those that don't conform to the anthorpomorphic template of two arms, two legs and a head.

Oh dear.