Rule 38 Federal Rules of Appellate Procedure
Rule 38 Federal Rules of Appellate Procedure is about Frivolous Appeal—Damages and Costs. It is under Title VII (General Provisions) of the Rules.
If a court of appeals determines that an appeal is frivolous, it may, after a separately filed motion or notice from the court and reasonable opportunity to respond, award just damages and single or double costs to the appellee.