Ru, ru, or RU may refer to:

  • Rù (入), the entering tone in Chinese language phonetics
  • Rú (儒), Chinese language term for Confucianism
  • Ru (kana), romanisation of the Japanese kana る and ル ; the same letters are used to substitute an L preceeding a consonant when transliterating latin script words to Katakana.
  • Rack unit
  • Rugby union
  • Chemical symbol for the element ruthenium
  • IATA airline code for AirBridge Cargo
  • ISO 3166-1 alpha-2 country code for Russia
  • ISO 639 alpha-2 code for the Russian language
  • .ru, the Internet country code top-level domain for Russia

Educational institutions

RU may stand for the following universities:

Cal Ripken's Real Baseball

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