Subpoena
Etymology
From the Latin phrase sub poena, "under penalty" (sub, "under," + poena, "penalty, punishment," itself from Greek poinē). These were the opening words of the writ, which warned the recipient to comply under threat of penalty. The phrase became the name of the order itself, and later a verb.
noun · /suh-PEE-nuh/
A legal order requiring someone to appear in court or produce documents, on pain of punishment for refusing.
What it names
The document that turns a request for testimony or records into a command you cannot simply ignore.
Example
The committee issued a subpoena for the internal emails the company had refused to hand over.
Related idea
A subpoena compels a witness or documents; an injunction instead orders someone to do or stop doing a particular act.