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I understand that this variable can be used to access component-level information, but I was wondering what the official term for it is.

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It is a namespace for Javascript API of Aura. Infact top namespace.(If your familiar with apex its almost like system class)

http://documentation.auraframework.org/auradocs#reference?topic=api:$A

Take a look at Aura documentation for same. Its top level namespace for creation of components, getting a component, setting a component, Enqueuing Action, Running an Action.

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    Indeed, as Mohit describes, you can just pronounce $A as "Aura".
    – Christian Carter
    Commented Jul 31, 2015 at 16:33
  • The link isn't accessible
    – Mohamed Ben HEnda
    Commented Aug 27, 2019 at 12:00
  • You can access the Aura documentation through your org. See the documentation for details.
    – Phil W
    Commented Nov 18, 2019 at 7:44
  • You used to be able to access it through your org, via https://<your-my-domain>.lightning.force.com/auradocs/reference.app, but it's moved again. You can now find it in the Javascript API section under References of the Lightning Aura Components Developer Guide
    – sskular
    Commented Sep 11, 2020 at 13:56

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