Association football | association football | National Football League | National Register of Historic Places | Forward (association football) | National Hockey League | Goalkeeper (association football) | Defender (association football) | England national football team | National Basketball Association | National Science Foundation | National Geographic | National Trust | American Association for the Advancement of Science | National Endowment for the Arts | National Geographic Society | Association of Tennis Professionals | Argentina national football team | National Trust for Places of Historic Interest or Natural Beauty | National Park Service | National League | Australian National University | National Guard | National Geographic Channel | National Institutes of Health | American Library Association | National Guard of the United States | World Boxing Association | National Collegiate Athletic Association | United States National Research Council |
Central vacuum installations can earn points for Leadership in Energy and Environmental Design (LEED) home certification, Health House certification by the American Lung Association, or the National Green Building Standard of the National Association of Homebuilders (NAHB).