Which term refers to a person appointed by the court to represent the interests of a child or mentally incompetent person?

The term that specifically refers to a person appointed by the court to represent the interests of a child or a mentally incompetent person is "guardian ad litem." This role is crucial in legal proceedings where the individual in question cannot advocate for themselves due to age or mental capacity. The guardian ad litem investigates the circumstances of the case and may make recommendations to the court regarding the best interests of the child or person lacking capacity.

In family law cases, for instance, a guardian ad litem may advocate during custody disputes, ensuring that the needs and well-being of the child are prioritized. This role is distinct from a general guardian, who may have broader responsibilities over the individual's personal and financial affairs, and from an advocate, who may support or endorse a position without necessarily having a formal legal role. The concept of power of attorney also differs, as it generally involves a person designating another to manage their affairs but does not involve court appointment and representation specifically for children or those unable to represent themselves.