NASDAQ. National Guard.N. A militia trained and equipped by the U.S. Army and Air Force that serves as reserve forces and can be mobilized by the president to help the armed forces with military operations or during states of emergency. National Labor Relations Board.N. An independent agency established by Congress through the National Labor Relations Act that works to prevent unfair labor practices by either employers or labor unions, oversees union elections, and adjudicates claims. ABBRV. ...