what does $ mean in pure Javascript

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I was watching a video about object literals in JS. Then the guy in the video did something like this: 

var Facebook = {
    name: 'Facebook',
    ceo: {
        firstName: "Mark",
        favColor: "Blue"
    },
$stock: 110
};

My question is why is there a $ sign in front of stock? Is there a special meaning? or did he just use it for naming purpose only? I entered $ in console and got something like this: function $(selector, [startNode]) { [Command Line API] }

I understand that $ sign is used as a selector for JS libraries like JQuery, but what is it's significance in pure JS?

jquery json javascript
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