Pro Se

Representing oneself. Serving as one's own lawyer.

Source: U.S. Courts

Used to designate an independent inventor who has elected to file an application by themselves without the services of a licensed representative.

Source: U.S. Patent and Trademark Office.

When a party represents themselves in a legal matter.

Source: Office of Child Support Enforcement

Refers to persons that present their own cases in court without lawyers; from the Latin for "on one's own behalf."

Source: California Courts.