>>1123065hmm, maybe, but /a/ was the first board made, because moot was a weeb. so to add a board called auto, it would make sense to use the last letter. I don't know if /t/ pre-dates /n/ or /g/, but they all start with "t" and /n/ and /g/ are also named after the final letter/sound, so it appears to be a naming convention.
I never thought about "o" being a wheel, though, that's pretty neat.