Omicron is the 15th letter in the Greek alphabet. Delta is the 4th. That means that unless I've not been paying attention, and I think I have, we've had 10 covid variants since the last major one that haven't made it onto the radar of the general unwashed.
Also, I'm a little disappointed that Nu, the 13th letter of the Greek alphabet, didn't turn out to be a thing. There was a lot of fun to be had with Nu-Covid.
I wonder what they'll start calling variants once they run out of Greek letters? We've only got 9 left.