It's in the dictionary as a short, high-pitched sound used to replace an expletive in a broadcast
However, the FCC does not actively monitor television 
broadcasts for ... A beep is a short, single tone, typically high-pitched, generally 
made by a... [DOC] [TLE] Voice - Holcomb Hathaway Publishers [PAR] In a visual medium such as television, it's easy to focus more on what you see ....