title: How to know when to use $variableName or just variableName?
body: <p>So I recently discovered that it is useful to name jQuery variables in a way that starts with "$" sign, so <code>var $progress</code> instead of <code>var progress</code> for example.</p>
  
  <p>What I don't understand is, how do you know when to use this? I mean there is such a thin line between javascript and jQuery (there isn't even a line, jQuery is JavaScript) would I use it on variables that are changed with jQuery or something? </p>
  
  <p>At this moment it seems to me that if you have a jQuery based solution that all variables would end up starting with "$", so I'd like to know when to actually do this so I don't confuse myself and others.</p>