It stands for Extreme. Since it has one of the most Extreme openings of all time!
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It doesn't stand for anything. X is added to make the name sound better. Megaman X, Sonic X, etcetera. It could stand for Extreme or something but that's looking a bit too much into it.
there is no animated sonic tv series after sonic x. sonic x IS the last sonic TV series.
Sally isn't in Sonic X
the Sonix X zone - it is check Sonic (disambiguation)
Hyper Sonic only appeared in Sonic the Hedgehog 3 and Knuckles. Only Super Sonic makes an appearance in Sonic X.
Yes he does its Manic and Sonia but the thing is there not in sonic x there in Sonic Underground and in Sonic X and adventure of Sonic Sonic thinks of Tails Prower as a brother