What letters are used in different European languages for naming things by letters? In Finnish, all 29 letters (also Å, Ä, Ö) are used in naming. But in Czech, letters with diacritics (e.g. Á, Š, Ů) are not used. For example, are special letters also used in e.g. Turkish, Icelandic, Slovene, etc.?

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    I meant what letters are used in enumeration.
    – Poiponen
    Dec 3, 2022 at 21:22
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    Since we answer questions about different writing systems here, I think this is on-topic, though I'm not sure linguists are the best people to answer it. Typographers are more likely to know.
    – Draconis
    Dec 4, 2022 at 1:11
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    It's not just diacritics. In Welsh 'dd', 'll', 'ff' and 'ng', 'ch', 'th', and 'ph' are regarded as letters, and alphabetized as such. I presume that if the letters are usedas an index for an enumeration they do likewise, though I haven't found any direct evidence either way.
    – Colin Fine
    Dec 5, 2022 at 16:49
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    @AdamBittlingmayer: OTOH, after Russia eliminated four redundant letters (ІѢѲѴ) from its alphabet in 1918, the railroads continued to use these letters to name locomotives for several more decades.
    – dan04
    Dec 6, 2022 at 21:15
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    @dan04 Interesting! ru.wikipedia.org/wiki/Ы_(паровоз) also exists. Dec 7, 2022 at 9:04


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