What is CET in trade?

Excuse me, could you please elaborate on what CET stands for in the context of trade? I'm somewhat unfamiliar with this acronym and how it relates to the field of finance or cryptocurrency specifically. Could you provide some context and explain its significance or role within the industry? It would be greatly appreciated if you could break it down in a way that's easy to understand for someone who might not be as well-versed in the jargon of the trade.