Hover your mouse pointer over those numbers on the webpage (which was coded by the Lemmy devs) - It says things like "2 points • 4 Upvotes • 2 Downvotes"

Reddit didn't invent those terms.

What do you call them here?

I assume the intended purpose is the same here as it is on Reddit - to flag spam, bots, and other intentional misuses of the platform. Maybe there are instances that don't utilize the feature?

Strange that I've seem someone complain about this before any usage of the term "sublemmy" instead of community.