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The Scandinavian languages, by contrast, treat the characters with diacritics ä, ö and å as new and separate letters of the alphabet, and sort them after z.
Some diacritical marks, such as the acute ( ´ ) and grave ( ` ), are often called accents.
In other alphabetic systems, diacritical marks may perform other functions.
Vowel pointing systems, namely the Arabic harakat ( ), which, respectively, mark abbreviations or acronyms, and Greek diacritical marks, which showed that letters of the alphabet were being used as numerals.
Also, aa, when used as an alternative spelling to å, is sorted as such.
Other letters modified by diacritics are treated as variants of the underlying letter, with the exception that ü is frequently sorted as y.