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![WMAQ]] in Chicago used a xylophone to play the notes (c. 1930)](https://commons.wikimedia.org/wiki/Special:FilePath/NBC Xylophone, c. 1930, gift of NBC Radio Chicago, WMAQ - Museum of Science and Industry (Chicago) - DSC06687.JPG?width=200 "WMAQ]] in Chicago used a xylophone to play the notes (c. 1930)")
![Anti-nuclear weapons]] protest march in Oxford, 1980](https://commons.wikimedia.org/wiki/Special:FilePath/Anti-nuclear weapons protest, UK 1980.JPG?width=200 "Anti-nuclear weapons]] protest march in Oxford, 1980")
.png?width=200 "Biohazard")
![The Biological Weapons Convention<ref>United Nations (1972). [https://front.un-arm.org/wp-content/uploads/2020/12/BWC-text-English.pdf Biological Weapons Convention].
</ref>](https://commons.wikimedia.org/wiki/Special:FilePath/Biological Weapons Convention original document.png?width=200 "The Biological Weapons Convention<ref>United Nations (1972). [https://front.un-arm.org/wp-content/uploads/2020/12/BWC-text-English.pdf Biological Weapons Convention].
</ref>")
![2007 ISO [[radioactivity]] danger symbol](https://commons.wikimedia.org/wiki/Special:FilePath/Logo iso radiation.svg?width=200 "2007 ISO [[radioactivity]] danger symbol")
![Protest in Amsterdam against the deployment of [[Pershing II]] missiles in Europe, 1981](https://commons.wikimedia.org/wiki/Special:FilePath/Overzicht op Museumplein met spandoek The Dutch disease is better for peace o, Bestanddeelnr 253-8627.jpg?width=200 "Protest in Amsterdam against the deployment of [[Pershing II]] missiles in Europe, 1981")
![A 2019 [[American Silver Eagle]] [[bullion coin]] with a fineness of 999 ('three nines fine'), together with a [[Walking Liberty half dollar]] with a fineness of 900 ('one nine fine').](https://commons.wikimedia.org/wiki/Special:FilePath/2019 American Silver Eagle and 1943 Walking Liberty Half dollar side by side.jpg?width=200 "A 2019 [[American Silver Eagle]] [[bullion coin]] with a fineness of 999 ('three nines fine'), together with a [[Walking Liberty half dollar]] with a fineness of 900 ('one nine fine').")
Definitie
Wikipedia
The NBC chimes are a sequence of three tones played on National Broadcasting Company (NBC) broadcasts. Originally developed in 1927 as seven notes, they were standardized to the current three-note version by the early 1930s, and possibly as early as 1929. The chimes were originally employed as an audible programming cue, used to alert network control engineers and the announcers at NBC's radio network affiliates. They soon became associated with NBC programming in general, and are an early example of an "interval signal" used to help establish a broadcaster's identity with its audience.
In 1950 the NBC chimes became the first "purely audio" service mark granted by the U.S. Patent and Trademark Office. They continue to be used as an audio signature by the NBC TV network and its affiliates, and also on the NBC Sports Radio network and at the opening of the hourly NBC News Radio broadcasts.
