What is it called when you take a case against the court?

When you take a case against the court, it is typically referred to as a "lawsuit" or "legal action." If you are challenging a court's decision or seeking to hold the court accountable for a perceived wrong, it may also be termed as "judicial review" or "appeal," depending on the context. Generally, the term "litigation" encompasses the broader process of taking legal action in a court of law.