茶​:orange_no:​助 is a user on mstdn.kemono-friends.info. You can follow them or interact with them if you have an account anywhere in the fediverse. If you don't, you can sign up here.
茶​:orange_no:​助 @tyanosuke

円周率がなぜ「π」と呼ばれるか、気になりませんか…?