query: What's the meaning of NBC?
passage: NBC
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.
passage: NBC Radio Network
In 1956, NBC sought to get an owned-and-operated television station in the Philadelphia market, so it forced a station ownership/call sign swap with Westinghouse Broadcasting. NBC acquired Westinghouse's KYW radio and WPTZ television in Philadelphia (which became WRCV-AM-TV, for the "RCA Victor" record label) while Westinghouse received NBC's WTAM-AM-FM and WNBK television in Cleveland (all of which took the KYW call signs). Westinghouse also received $3 million in cash compensation.