It looks like you're describing various diacritical marks or typographical symbols that are used in different languages to modify the pronunciation or meaning of letters. Here's a brief explanation of each:
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A dot in the middle of a word: This could refer to a tittle, like the dot over the letters "i" and "j". In some contexts, it could also refer to the interpunct (·) used in certain languages or for various purposes, such as separating words.
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A line above a letter: This describes a macron (ˉ), which is a horizontal line placed over a vowel to indicate that the vowel should be pronounced as a long sound. It's used in languages like Latin, Māori, and some phonetic alphabets.
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An accent mark: This could refer to several types of accentuation, such as an acute accent (´) which indicates a particular pronunciation, especially in languages like Spanish, French, and Portuguese. Other examples are the grave accent (`), circumflex (ˆ), and tilde (˜).
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A curved symbol above a letter: This likely refers to a tilde (˜) placed over a letter, such as in the Spanish letter "ñ" which has a tilde, indicating a nasal sound. It could also describe a caron (ˇ), which alters the pronunciation of certain consonants in languages like Czech and Slovak.
If you need more detailed information or specific examples concerning any of these marks, feel free to ask!