The symbol from the TV series Charmed exists in real life and has a very ancient history. It is called a triquetra.
In the Bronze Age in Europe, it was used to mark the position of the Sun in the sky (sunrise, zenith, and sunset) and also the lunar phases. It also stood for the cycles of nature. The symbol was popular among the Celts and the Scandinavians.
Play, pause, and stop
It’s not really certain who created these signs. According to one version, it was the artist Wassily Kandinsky; according to the other, it was Rain Wersem, the creator of one of the first cassette players.
The logic of the signs “stop“ and ”play“ is this: a square is a stable form, and a triangle symbolizes movement. The “pause” sign evolved from the musical sign ”сaesura,“ used to split musical phrases. The ”record” button is red so that nobody presses it accidentally and erases something important.