I think the comic is trying to illustrate the difference between people who consider Y to be the vertical axis or z to be the vertical axis.

I think the right hand rule vs left hand rules coordinate systems was a mistake.

There are clearly more than two. In the top image that z-axis is pointing in the wrong direction.

RSS/Atom can contain a summary, or it can be the full article. It’s the choice of the website what to put in it. They only put a summary to force you to visit their webpage to serve ads.

Cryptpad