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

1.
signo diacrítico, 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.
El acento agudo es un signo diacrítico común en francés.
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Many languages use diacritics to distinguish between words with similar spellings.
Muchos idiomas usan signos diacríticos para distinguir entre palabras con ortografías similares.