title: Common variable names in different languages
body: <p>I see a lot of different styles of variable names used in different kind of languages. Sometimes these names are lowercase and using underscores (i.e. <code>test_var</code>) and other times I see variables like <code>testVar</code>.</p>
  
  <p>Is there a specific reason why programmers use different variable name styles in different languages?</p>