BUR #10246 has been approved by @nonamethanks.

deprecate angle

A very small tag, consisting of a wide variety of posts: mostly multiple_views, some mistagged dutch_angles, and two posts about the mathematical concept. Therefore, an unneeded total mess.

I mean, we could keep it (after renaming to angle_(mathematics) or something) for just the two posts about actual angles being referenced, but outside of that, I'd say it doesn't really have a place.