From Wikipedia, the free encyclopedia.
- 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.

