It is a way of saying "acute accent", which is when a Word takes its tone on the last syllable. In graph, is the character ´, which generally placed above a vowel indicates its pronunciation as acute. Spanish uses only this sign of accent or tilde combined with vowels, and depending on which syllable is we know if it is a word acute, grave, esdrujula or (now almost non-existent and deprecated) sobresdrujula.
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