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UU may refer to:

In computing:

  • Unique users, may be counted as part of web analytics in determining the popularity of a website
  • UUNET, Internet Service Provider commonly referred to as 'UU'
  • Unix-to-Unix, as in uuencode, a data transport encoding

In education:

In linguistics:

  • "uu", an old way of spelling the letter "w" in certain Germanic languages (e.g. the Merseburg Incantations spell the name of the god Woden as Uuôdan).
  • The letter combination of uu


In religion:

  • An abbreviation for Unitarian Universalist, a follower of Unitarian Universalism, a theologically liberal religion characterized by its support for a "free and responsible search for truth and meaning."

Other uses:

See also[edit]