Diacritical mark under a 'c'

• Mark suggesting a 'c' should be pronounced an 's'
• Under-C hook
• Mark in the intersection of 58-Across and 43-Down
• Pronunciation aid
• Letter attachment?
• Cousin of the tilde and umlaut
• Mark placed under the letter c

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
cedilla \ce*dil"la\ (s[-e]*d[i^]l"l[.a]), n. [Sp. cedilla, cf. F. c['e]dille; dim. of zeta, the Gr. name of the letter z, because this letter was formerly written after the c, to give it the sound of s.] A mark placed under the letter c [thus, [,c ...

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
c.1600, from Spanish cedilla , zedilla , literally "little z," from a Latin-like diminutive of Greek zeta "the letter 'z'." The mark (formerly also used in Spanish) was derived from that letter and indicates a "soft" sound in letters in positions where ...

Wikipedia Word definitions in Wikipedia
A cedilla ( ; from Spanish ), also known as cedilha (from Portuguese) or cédille (from French), is a hook or tail ( ¸ ) added under certain letters as a diacritical mark to modify their pronunciation. In Catalan , French , and Portuguese , it is used only ...