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1. Short for Registry Usage, RU is a Windows Sysinternals utility to view the Registry space usage for the specified Registry key.

2. When referring to a domain, .ru is the country code for Russia.

3. Shorthand for are you, RU is a term often used in text-based communications such as chat. Below are some examples of how this could be used.

RU ok?

Hey RU there?

Also see: Chat terms