pro per

Definition from Nolo’s Plain-English Law Dictionary

A term derived from the Latin "in propria persona," meaning "for one's self," used in some states to describe a person who handles his or her own case, without a lawyer. In other states, the term pro se is used. When a nonlawyer files his or her own legal papers, that party is expected to write "in pro per" under his or her name in the heading on the first page.

Definition provided by Nolo’s Plain-English Law Dictionary.