Ruby
Variety of corundum, mineral, gemstone

A ruby is a pinkish red to blood-red colored gemstone, a variety of the mineral corundum. Ruby is one of the most popular traditional jewelry gems and is very durable. Other varieties of gem-quality corundum are called sapphires. Ruby is one of the traditional cardinal gems, alongside amethyst, sapphire, emerald, and diamond. The word ruby comes from ruber, Latin for red. The color of a ruby is due to the element chromium.
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https://en.wikipedia.org/wiki/Ruby_(programming_language)
Ruby (programming language) - Wikipedia
https://github.com/w3c/feedvalidator
GitHub - w3c/feedvalidator: W3C-customized version of the feedvalidator (forked from https://github.com/rubys/feedvalidator/)
W3C-customized version of the feedvalidator (forked from https://github.com/rubys/feedvalidator/) - GitHub - w3c/feedvalidator: W3C-customized version of the feedvalidator (forked from https://github.com/rubys/feedvalidator/)
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