For a comprehensive list of the collating orders in various languages, see Collating sequence.
Modern computer technology was developed mostly in English-speaking countries, so data formats, keyboard layouts, etc.
With the advent of Roman type it was reduced to the round dot we have today.), were used to mark pitch accents in Hangul for Middle Korean.
The tilde, dot, comma, titlo, apostrophe, bar, and colon are sometimes diacritical marks, but also have other uses.
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.
This varies from language to language, and may vary from case to case within a language.
English is the only major modern European language requiring no diacritics for native words (although a diaeresis may be used in words such as "coöperation").