Can I delete the OS 9 in my applications folder

I'm trying to remove the old files. As I have now El Capitan, is it OK to remove the OS 9 of my applications folder?

Do you really, really, really, really means OS9 dating for almost 18 years ago?  Or do you mean iOS9 which is something very different (the names are important!)?

Tags: Mac OS & System Software

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