What does $ sign mean in jQuery?

In the following JavaScript code there is a dollar sign $. What does it mean?


$(window).bind('load', function() {
    $('img.protect').protectImage();
});

By reviewing the jQery Web page, jQuery()===$().

jQuery$(document).ready(function() {
    jQuery$("#myDiv").text("Hello jQuery!");
});

Your snippet of code looks like it’s referencing methods from one of the popular JavaScript libraries (jQuery, ProtoType, mooTools, and so on).

There’s nothing mysterious about the use of $ in JavaScript. $ is simply a valid JavaScript identifier.

JavaScript allows upper and lower letters, numbers, and $ and _. The $ was intended to be used for machine-generated variables (such as $0001).

Prototype, jQuery, and most javascript libraries use the $ as the primary base object (or function). Most of them also have a way to relinquish the $ so that it can be used with another library that uses it. In that case you use jQuery instead of $. In fact, $ is just a shortcut for jQuery.

Taken from StackOverflow

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