RU may refer to any of the following:

  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, for example:

RU ok? Hey RU there? How RU doing? RU serious?

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