Microsoft® Manual of Style, Fourth Edition

R

radio button

International considerations

Radio button is a problem term for the worldwide audience. Do not use radio button except in content for software developers in which the application programming interface includes the term. In that case, use wording such as <name> option button (also known as a radio button). If your content has an index, include radio button in the index with a cross-reference to option button.

In other content, refer to a radio button by its label. If you must provide a descriptor, use option. Use the exact label text, including its capitalization, but do not capitalize the word option itself. You should generally refer only to the option that the radio button controls. If you must refer to the button to avoid ambiguity, ...