[kleiba]

Even the lower-case x like that?

[croemer]

I was taught lower case x starts at top left, does the arc to bottom left, then goes to top right, arc to bottom right, all in one stroke.

The upper case X didn't have a horizontal line in my case, otherwise it's all pretty much the same as this 1941 doc.

[netsharc]

This is useful in Maths, where that letter can be confused with the multiplication sign.

[cenamus]

Probably not, at least in my case it is just some lower left to top right line, then the crossing line starting from the top left