I didn't understand the name until I watched one of the T.V. ads that someone linked to in this discussion. It appears to be a reference to the act of rotating

I didn't understand the name until I watched one of the T.V. ads that someone linked to in this discussion. It appears to be a reference to the act of rotating a smart phone 90 degrees so as to watch 16:9 video in full-screen. "Going 90," in other words.