I thought it would be nice to have a HD icon, like x-square and many others.
I did really on Illustrator something like this:
(ignore the black D, I don't know how to make it intersect)

Inspired by this:
https://material.io/tools/icons/?search=hd&icon=hd&style=outline

• Icon name: HD (High Definition)
• Use case: Video player
• Screenshots of similar icons:

I think if you can get the margins correctly, it can become a really nice icon and not hard to make.

This is the project, in case anyone wants to play with it:
x-square-hd.ai.zip