I have four names that I'd like to throw into the hat.
4. Truth (though I believe Behringer use this for a speaker line)
If I were to choose one, I'd submit "Evidence".
An axiom is a premise so evident that it is accepted as true, without controversy.
The proof, as they say, is in the pudding. Evidence, in this case, being the proof.
Besides, Axiom Evidence just rolls off the tongue nicely doesn't it?
Full disclosure - I won the outdoor M3 naming contest. I hope this does not disqualify me from this contest!
Good luck to all.