[bluGill]

Catv originally stood for 'community antenna' and was for those who lived in a valley where tv signals couldn't reach. The community built one antenna at the top and ran a cable down to everyone. Of course it was an obvious addition after that to add extra channels.

[hyperdimension]

Interesting! That makes sense now. I thought it stood for CAble TV and always wondered why they used two letters instead of just CTV.