The term referring to representing oneself in a trial is Counsel Absolute right Warrant Pro se

Pro se, is the right answer.

Explanation:

Pro Se is a Latin term which means "for oneself". In modern law, Pro Se is used to present one on their own behalf. It means one can contend for himself/herself as a defendant in a legal procedure and criminal cases and the plaintiff in civil cases.

Although the majority of individuals appearing before the court are generally represented by attorneys, a small number of litigants appears as Pro Se.