Standard jQuery noConflict wrapper - waits till $.ready event before executing. Very common in WP JS code

jQuery-noConflict-wrapper.js

jQuery(document).ready(function($) {
    // Inside of this function, $() will work as an alias for jQuery()
    // and other libraries also using $ will not be accessible under this shortcut

    // Put your code here e.g. $('#page').find('.comments').each( myFunc()); etc

});