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"А/а" is the first letter of the Cyrillic alphabet, used in Russian and many other Slavic and non-Slavic languages. It represents the vowel sound "ah" and is fundamental to reading and writing in any language that uses the Cyrillic script.
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Letter А, page from Elisabeth Boehm's Azbuka
А (А а; italics: А а or А а; italics: А а) is a letter of the Cyrillic script. It commonly represents an open central unrounded vowel /ä/, halfway between the pronunciation of ⟨a⟩ in "cat" and "father". The Cyrillic letter А is romanized using the Latin letter A.