What is FEI in banking?

Can you please clarify what you mean by "FEI" in the context of banking? It's not a widely recognized acronym in traditional banking terminology. However, if you're referring to the cryptocurrency world, there is a stablecoin called Fei Protocol (or simply FEI) that aims to maintain a 1:1 peg with the US dollar through a combination of algorithmic stabilization and decentralized finance (DeFi) mechanisms. If that's the case, FEI is not directly related to traditional banking but operates within the decentralized financial ecosystem. Could you please specify your intended context for "FEI in banking" so I can provide a more accurate answer?