Answer:
A case in which all appellate court judges participate is called an en banc hearing or en banc review.
Step-by-step explanation:
A case in which all appellate court judges participate is called an en banc hearing or en banc review. En banc is a French term meaning "in bench," and it signifies that the case is being heard by the full bench or all the judges of the appellate court, rather than a smaller panel of judges. En banc hearings are typically reserved for significant or complex cases, and they provide a comprehensive review and decision by the entire court, which can result in a more authoritative and binding precedent.