puntuación - Are inverted question and exclamation mark supposed to be symmetrical to the "normal" counter-parts? - Spanish Language Stack Exchange
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Upside Down Exclamation Point (Meaning, How to Type & Shortcodes)
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xetex - upside down question/exclamation mark - TeX - LaTeX Stack Exchange
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ASCII code Inverted exclamation marks, American Standard Code for Information Interchange, The complete ASCII table, characters,letters, vowels with accents, consonants, signs, symbols, numbers inverted, exclamation, marks,ascii,173, ascii art, ascii ...
Why Does Spanish Use Upside Down Punctuation Marks?