cedilla
/sɪˈdɪlə/noun
1- a mark (, ) written under the letter c, especially in French, to show that it is pronounced like an s rather than a k (e.g. façade)下加符, 尾形符（尤指法语字母c下的符号, 表示该字母发s而非k之音, 如façade）。
1.1
- a similar mark under s in Turkish and other oriental languages（土耳其及其他东方语言中加在字母s下的）下加符, 尾形符。
词源
late 16th cent.: from obsolete Spanish， earlier form of zedilla, diminutive of zeda (the letter Z)， from Greek zēta.