According to the article, that's exactly where it came from.

Sadly, the symbols mentioned in the article aren't always used the way they should. For instance, earlier today there was a link on HN about an HTML5 audio player, Speakker [1], which uses the standby symbol as a play button. Confuses the hell out of me.

[1] http://www.speakker.com/demo/

If I hadn't read your comment I would have been very confused as well, it made me pause for a second before clicking.

Either way I wanted to thank you for leading me to some very awesome music which is available under Creative Commons!