C with cedilla
On Windows, hold Alt and type 0231 or 135 on the number pad, then let go of Alt.
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About the c with cedilla
The little tail under ç began in medieval Spain as the bottom half of a small cursive z, and cedilla is the Old Spanish word for “little z”. Spanish itself gave up ç in the eighteenth century, replacing it with z or c.
It lives on in French, as in français, and in Portuguese and Catalan. In Turkish and Albanian ç is a letter of its own, sounding like the ch in church.