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The fact that it is used by several entities makes it public domain, if that is what you are worried about. There is nobody that "owns" the acronym if it is used by many independent entities. +1 t...
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#4: Attribution notice removed
Source: https://writers.stackexchange.com/a/31685 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#3: Attribution notice added
Source: https://writers.stackexchange.com/a/31685 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
The fact that it is used by several entities makes it public domain, if that is what you are worried about. There is nobody that "owns" the acronym if it is used by many independent entities. +1 to ItWasLikeThat: National does not equal World, or Worlds. You might want to look through a dictionary for some other word starting with N, like "Necessary".