Meaning of some phrases in native javascript

I have a native javascript and some syntax don’t mean anything to me. It’s also hard to search on it on google. Possibly they are short term for something? (Its supposedly native js, no jquery)

What does this mean in these codes:

  • $.get = () => value();
  • return $; (what means the $ ?)
  • ((win, doc, name) => { ... }

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