Ru
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Ru, ru, or RU may stand for:
- Reykjavík University, Iceland
- Rutgers University, in New Jersey, United States of America
- Ru, a minor fertility god in Polynesian mythology
- Ru, in Chinese language phonetics, the 4th tone of both Middle Chinese
- Russia, ISO 3166-1 alpha-2 country code
- Russian language (ISO 639 alpha-2, ru)
- ruthenium (Ru), the symbol for the chemical element
- An Internet abbreviation of "are you"