I can notice this animation looks like an default pattern, because I've seen it at so many apps and websites.
I would like to know what's the name of it but I can't find any results.
Additionally, you might find this answer useful if you're looking for How to create a “Please Wait, Loading…” animation using jQuery?.
Bonus: Google Material Design Preloader for mobile design.
It is just a different take on a wait spinner, which is called a preloader and is sometimes called a Loading animation.
Preloaders come in all shapes and sizes.