What is C at CEX?

Could you please clarify what "C at CEX" refers to? Are you asking about a specific cryptocurrency or token that is traded on a cryptocurrency exchange abbreviated as CEX? Cryptocurrency exchanges often list various digital assets, each with their unique ticker symbols, and it's possible that "C" represents a particular cryptocurrency that is traded on this exchange. However, without more context, it's difficult to provide a definitive answer. If you could provide more information or specify the exact exchange and cryptocurrency you're referring to, I might be able to give a more accurate description.