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Famous javascript libraries,
all uses $. What’s the significance of $ ?
and also, even php uses it to declare variables. I am sure some other languages uses it too.
It’s just a character that can be part of identifiers in JavaScript. No special significance outside of the fact that it’s distinctive-looking. It’s easy to recognize when you’re scanning over code.
Now, in other languages, it can (and does) mean all sorts of things. The term sigil has come into fashion when referring to “special” characters that have syntactic significance in a programming language, specifically as modifying the semantics of a reference to a variable. In JavaScript, I would not use that term for “$” because it doesn’t mean anything in particular to the interpreter.
edit — as noted in a comment, “$” has a role in JavaScript regular expression syntax, but I wouldn’t consider that related in any way to its use in variable names. (Maybe somebody would; I don’t know.)