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Diacritics are symbols added to letters to modify their pronunciation, value, or appearance. They are commonly used in various languages to distinguish between words that would otherwise be spelled the same. Diacritics can appear above, below, or within letters, and they can be combined with each other to create complex symbols. Some of the most common diacritics include the acute accent (´), grave accent (`), circumflex (ˆ), umlaut (¨), cedilla (¸), and tilde (~). Diacritics are essential in many languages, such as Spanish, French, German, and Vietnamese, where they help to convey subtle differences in meaning and pronunciation. In some cases, diacritics can also indicate stress or tone in a word. The use of diacritics has evolved over time and varies across different languages and writing systems.