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Many software I have seen in open source projects, have just some versions with a r1 or r2 suffix, but it looks like Google is unable to find an answer.

user4388177
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2 Answers2

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It depends on how companies name the versions. Usually R could mean Release. Spring follows RC naming which means Release Candidate(RC).

I found this old SO thread - What is the difference between GA, RC and M2 release?

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Rolson Quadras
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I found it is also often used as revision number.

E.G. Gentoo packages use rX to indicate a revision applying Gentoo specific patches to the package.

The answer @RolsonQuadras provided is nonetheless correct, too.

user4388177
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