The National Broadcasting Company (NBC) is an American English-language commercial terrestrial television network that is a flagship property of NBCUniversal, a subsidiary of Comcast. The network is headquartered at 30 Rockefeller Plaza in New York City, with additional major offices near Los Angeles (at 10 Universal City Plaza), Chicago (at the NBC Tower) and Philadelphia (at the Comcast Technology Center). The network is one of the Big Three television networks. NBC is sometimes referred to as the "Peacock Network", in reference to its stylized peacock logo, introduced in 1956 to promote the company's innovations in early color broadcasting. It became the network's official emblem in 1979.
NBC has thirteen owned-and-operated stations and nearly 200 affiliates throughout the United States and its territories, some of which are also available in Canada via pay-television providers or in border areas over-the-air; NBC also maintains brand licensing agreements for international channels in South Korea and Germany.