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Re:UTF-8 Everywhere by mlj45 on Tuesday April 14, 2020 @01:38PM (#22868918)
This depends on your definition of informal terms like "letter", "character" etc.

The typographic term for combinations like this is "digraph". (Wikipedia's definition: "A digraph [...] is a pair of characters used in the orthography of a language to write either a single phoneme [...] or a sequence of phonemes that does not correspond to the normal values of the two characters combined".)

Whether digraphs have separate keys on a keyboard, are treated as distinct for the purposes of alphabetisation, whether speakers of the language think of them as separate "letters" when spelling out a word and so on, are all separate issues and varies between languages (or, more precisely, between the conventions for writing a certain language).

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