In the badges page there are lots of numbers on display, including 1000, 2500 or 10000.
The display is erratic though:
Same number, two displays.
Both appear valid to me: 1000 or 1,000 but please, make it consistent. My eyes hurt! :)
I just found this other post, but there it's discussing the whole network while I'm asking just for that specific page. For a start.