No- that is not a badge. If you are thinking that the badge is a challenge patch, no, either- challenge patches are supposed to be for a specific subject in a course, like "2nd grade: Place Value". "2nd grade" is the course, and "Place Value" is the subject.

Thank you. I noticed some people have badges like 'Master of Arithmetic'. Do you know how to get such a badge?

Those are old badges that are already "retired" and they cannot be given out any more.

But, they may (or may not) return sometime in the future as we move from our current code base.

Yes, that is true.

For example, 1000 Kelvin will be back as soon as KA finishes migrating to the Go codebase.

As part of our Support Community improvement project, we’re preserving inactive posts that have historical or community value and closing them to new comments. This is one of them!

If this post covers a topic that you’re interested in discussing with the community or requests a feature you’d like to see on Khan Academy, you can try to find an active post about it and add your thoughts (or feel free or create a new post if it doesn’t yet exist in the forum).