Comment by stackghost

Whichever field of study these backwards E symbols are from, I've never taken a course in it.

So for me it's "Backwards E a raven Italics Backwards E the vector of hours" and I closed the tab there.

After reading this comment the symbols are now clear but by that point I'd already lost interest and moved on with my life.

Maybe this is only for people who already know set theory or whatever the backwards E comes from, and that's fine, I guess, but it was pretty annoying not to have any explanation whatsoever at the top.

I only learned that this is something to do with clocks from the comments.