The diaeresis (/daɪˈɛrɨsɨs/, dy-err-ə-səs; plural: diaereses), also spelled diæresis or dieresis and also known as the trema or the umlaut, is a diacritical mark that consists of two dots ( ¨ ) placed over a letter, usually a vowel. When that letter is an i or a j, the diacritic replaces the tittle: ï.[1]
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