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"Р" is a letter in the Cyrillic alphabet, which is used to write Russian and several other Slavic and non-Slavic languages. It represents a consonant sound similar to the "r" in English and is one of the fundamental building blocks for writing and reading these languages.
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Er, from Alexandre Benois' 1904 alphabet book Er (Р р; italics: Р р or Р р; italics: Р р) is a letter of the Cyrillic script.
It commonly represents the alveolar trill /r/, like the "rolled" sound in the Scottish pronunciation of ⟨r⟩ in "curd".