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Word combination (there is no dot on the i after iOS f) 
Synonyms, ligatures, linking characters or combined characters (English: Ligature) generally mean that more than one letter is combined into one font in western typesetting. For example, in printed materials, the point above i of the two Latin letters fi is often combined with the hook of f, while the German letter ß was originally ss, and so on. The combined characters of Chinese characters are also called combined characters or combined characters under different circumstances