Ah, the classic Egyptian Eye pose.

Actually there is unironically a word for it:

https://en.wikipedia.org/wiki/Opisthotonus

Cat hat hook.

I think it's one of these...

That shape is called a "cat".

~

noodle

Catenary curve.

Purrabola

Reticulated sp(l)ine.

Purr-abola.

Bezier purrve.

Cat

new kind of maths: that is a pair-of-bollock curve

Looks exactly like a cat to me. Nice shadow puppet.

Cat-shape #8.

Tilde

Appropriate that it's used in logic to denote negation, and you have a void there.

It's a trap.

This is, scientifically speaking, called "stretcho's"

Catatellogram.

Void

It's .9π

Hoooogarfield curve.

Better fix that hole in the floor.

That would be a 3 dimensional image of the 4 dimensional hyper-cutie

Classic yawning pose. Arching pose?

Either good kitten or sausage

As a German, I can offer "Ein Schluck Wasser in der Kurve".