A mark ( ¸ ) placed underneath the letter c, such as the spelling associated with French term garçon, to indicate that the letter is to be pronounced (s).
when you look at the spelling of Catalan, French, Portuguese and some other languages, a mark sometimes placed directly under the letter c to indicate that it's pronounced /s/ rather than /k/, as with French menaçant and Portuguese almoço, as well as found in some other languages to change the noises of other letters.
A mark placed under the letter c [thus, ç], to show that it is to be sounded like s, as in façade.
A mark placed under the letter c (hence, ç), especially in French and Portuguese, and formerly in Spanish, before a, o, or u, to indicate that it's become sounded like s, rather than like k, as it often is before those vowels.
a diacritical level (,) put underneath the letter c to indicate it is pronounced as an s