Subpoena ad testificandum is a legal term used to refer to a court order that compels someone to appear before a court or a tribunal and give testimony. However, there are various terms that are used interchangeably with subpoena ad testificandum. For instance, the phrase subpoena duces tecum is equivalent to subpoena ad testificandum when a witness is required to bring along with them certain documents or material when they appear before the court. Another synonym for subpoena ad testificandum is an "order to appear" which is a more general term and refers to any legal order for an individual to appear in court. Other common synonyms for subpoena ad testificandum include demand for testimony, summons, and citation to appear.