title: When should I use the dollar symbol ($) in a variable name?
body: <p>The dollar symbol ($) is a valid character to name a variable, e.g. <code>String superSecretFormula$;</code>, but when we're talking about naming conventions, when should I use this symbol?</p>
  <p>Underscore for example is mostly used to separate words, as blank spaces can't be used.</p>