di·a·crit·i·cal
adjective/ˌdaɪəˈkrɪtɪkl/
/ˌdaɪəˈkrɪtɪkl/
(linguistics)- used to describe marks such as accents, placed over, under or through a letter in some languages, to show that the letter should be pronounced in a different way from the same letter without a mark
变音符，附加符号（置于字母上方、下方或穿过字母，表示发音不同） - diacritical marks
变音符
- diacritical marks