Русско-англо-русский юридический словарь

A judicial panel is a set of judges who sit together to hear a cause of action, most frequently an appeal from a ruling of a trial court judge. Panels are used in contrast to single-judge appeals, and en banc hearings, which involves all of the judges of that court. Most national supreme courts sit as panels. (Wikipedia)

If an appeal proceeds to the oral stage, a decision is made as to whether this will be before a single judge or a judicial panel of three. (Journal of Law and Society, Volume 47, Issue 1)