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Unfortunately for Copper in particular, .cu is associated with CUDA (so perhaps that’s why).
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And don’t ask what it means in Portuguese.
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My first thought
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Not a programming language, but Jane Street has (had?) a code review tool called Iron, abbreviated "fe".

https://blog.janestreet.com/code-review-that-isnt-boring/

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And they’re not alone — mercurial is hg and the silver searcher is ag.
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I like the way you think.
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You're appreciated
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