From [Wikipedia](https://en.wikipedia.org/wiki/Coordinated_Universal_Time):

> The official abbreviation for Coordinated Universal Time is *UTC*. This abbreviation arose from a desire by the [International Telecommunication Union][1] and the [International Astronomical Union][2] to use the same abbreviation in all languages. [English][3] speakers originally proposed CUT (for "coordinated universal time"), while [French][4] speakers proposed TUC (for "*temps universel coordonné*"). The compromise that emerged was *UTC*, which conforms to the pattern for the abbreviations of the variants of Universal Time (UT0, UT1, UT2, UT1R, etc.)


  [1]: https://en.wikipedia.org/wiki/International_Telecommunication_Union
  [2]: https://en.wikipedia.org/wiki/International_Astronomical_Union
  [3]: https://en.wikipedia.org/wiki/English_language
  [4]: https://en.wikipedia.org/wiki/French_language