Ruby
- Ruby is a red gemstone, one of the hardest minerals.
- Jack Ruby (Jacob L. Rubenstein) is the man who killed Lee Harvey Oswald, who in turn was the assassin of United States President John F. Kennedy in 1963.
- Ruby characters are sometimes used in the typography of ideographic languages, especially Japanese and Chinese.
- Ruby is an object oriented computer programming language originally developed for scripting.
- Ruby was a British television chat show hosted by Ruby Wax.
- Pokémon Ruby, a video game
- Ruby, a new Egyptian Pop singer
- Ruby Hardware Description Language
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