What is the CFR fee?

Excuse me, could you please elaborate on what the CFR fee entails? I'm somewhat unfamiliar with the term and its application in the context of cryptocurrency transactions or financial services. Is it a specific type of charge levied by a regulatory body, an exchange platform, or perhaps a third-party service provider? Could you also explain any potential implications or considerations one should keep in mind when dealing with this fee? Your insight would be greatly appreciated.