diacritic
US /ˌdaɪ.əˈkrɪt̬.ɪk/
UK /ˌdaɪ.əˈkrɪt̬.ɪk/

1.
diacrítico, sinal diacrítico
a mark, sign, or symbol added to a letter or character to indicate a specific phonetic value, stress, tone, or other linguistic feature
:
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The acute accent is a common diacritic in French.
O acento agudo é um diacrítico comum em francês.
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Many languages use diacritics to distinguish between words with similar spellings.
Muitas línguas usam diacríticos para distinguir entre palavras com grafias semelhantes.