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Some diacritics and special characters (like ligatures) are accepted in Contemporary English: https://en.wikipedia.org/wiki/English_terms_with_diacritical_marks

Examples of English spellings: coöperative, reëlect, naïve, soupçon, frappé, piñata, Geiger–Müller, Wilhelm Röntgen, László Bíró, …

Some others aren't accepted and wouldn't be used in any publication for an English spelling.

Examples of characters never used in English words: ⱥ, Ω, あ, …

What are the lists of characters with diacritics or special characters (like ligatures) accepted in Contemporary English words?

Question is narrowed to reference organisms or major publications, as:

  • Dictionaries
  • Universities, Academic publications
  • Newspapers

Question does not include:

  • anything non-Contemporary, i.e. older than October 6, 1960 (American Standards Association's first meeting to create ASCII)
  • non Latin/Roman characters, as you would perform romanization on it to make it an English spelling
  • symbols (Ƭ̵̬̊) or emojis (😂, Oxford Dictionaries 2015 Word of the year)
  • fiction publications, blogs

Example possible partial list of accepted characters based on Wikipedia article above, would be (in lowercase mostly): äëïöüáóíéèàìôēāăŏčšřžåçșñďľňťŁđćĦ

closed as primarily opinion-based by sumelic, Drew, user140086, Chenmunka, Edwin Ashworth Nov 21 '16 at 10:31

Many good questions generate some degree of opinion based on expert experience, but answers to this question will tend to be almost entirely based on opinions, rather than facts, references, or specific expertise. If this question can be reworded to fit the rules in the help center, please edit the question.

  • It depends on the publisher. There is no official list, as there is no single definition of standard English. – sumelic Nov 21 '16 at 4:02
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  • You don't get to pick and choose how to write somebody else’s name. If it’s written in the thing we have come to call the Latin alphabet, then you have to write it the way they tell you to. It doesn’t matter if it as letters we don't use in English. If you don’t believe me, then Hafþór Júlíus Björnsson might care to have a word with you. Please see this related question, especially the excerpt from Bringhurst. – tchrist Nov 21 '16 at 4:11
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    This is arbitrary and differs according to domain. For instance, though you say 'Examples of characters never used in English: ⱥ, Ω, ...', Ω is often used in English science textbooks. Also, an illustation could contain any symbol. – Edwin Ashworth Nov 21 '16 at 10:29
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    @tchrist, I think it's worth to put Robert Bringhurst's opinion as an answer instead of just a comment. – Cœur Nov 23 '16 at 5:15