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Here is an example of initializing a global variable in one jQuery function and using it in another function:

// Initialize global variable in function 1
var myVar;

$(document).ready(function() {
   myVar = "Hello world";
});

// Use global variable in function 2
$(document).on("click", "#myButton", function() {
   alert(myVar);
});

In this example, we initialize a global variable called myVar in the $(document).ready() function. This function sets myVar to the string "Hello world".

Later in the code, we use the myVar variable in a click event handler for a button with the ID myButton. The click event handler function uses alert() to display the value of myVar.

Note that because myVar is a global variable, it can be accessed and modified from any function in the script.