title: Is there any specific reason behind using $ with variable in jQuery
body: <p>I know it's a silly question but I am a bit confused with this. For example, if I have an input with an ID: <code>rad1</code>, is there any difference between below lines of code? </p>
  
  <pre><code>var $a = $('#rad1')
  </code></pre>
  
  <p>or  </p>
  
  <pre><code>var a = $('#rad1')
  </code></pre>