Code was often referring to pie menus using the term "radial" which just obfuscates that it relates to pie menus. Just call it what it is directly. Doesn't replace usages of the term for names that are not strictly tied to pie menus. Also doesn't change instances of the term in the Python API to keep compatibility, noted in #110461. Pull Request: https://projects.blender.org/blender/blender/pulls/122825