What does the “C” at the top right of my keyboard mean? Sam L. April 26, 2018 18:55 Follow C = Caps Lock (Fig. 01) Toggling this will cause all letters to generate capital letters Fig. 01 / MK Mac USB Indicator. Have more questions? Submit a request Comments Article is closed for comments. Articles in this section What does the “C” at the top right of my keyboard mean?