Aleph-one. I had always seen it written as Aleph sub C. They knew it was bigger, but they didn't know if there were any infinities between Null and C, so they were reluctant to call it Aleph one.
I was discussing this with a professional mathematician colleague of mine and he said that they don't do this any more. He believes that someone has actually proven that C=1 (there are no infinities larger than aleph null and smaller than aleph C).
Caveat: He's a super smart guy, but I think his forte is probability theory and analysis of algorithms.
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