There's a particular one-kilohertz tone that is universally understood to be covering up inappropriate words on radio and TV. But there are other options, too, like silence -- so why did this particular *bleep* sound become ubiquitous?

Bleep!

Subscribe to SiriusXM Podcasts+ to listen to new episodes of 99% Invisible ad-free and get exclusive access to bonus episodes. 
Start a free trial now on Apple Podcasts or by visiting siriusxm.com/podcastsplus.