title: Define a sympy symbol for physics value "hbar" that will print with latex
body: <p>Sympy has the ability to print expressions with latex.  In pure latex, the physics symbol <img src="https://i.stack.imgur.com/ow0Lc.png" width="10" height="15" > ("hbar") is simply <code>$\hbar$</code>.</p>
  
  <p><code>sympy.galgebra.GA</code> has a <code>make_symbols()</code> method that provides extended symbol naming capabilities, but I don't see a way to create "hbar".</p>
  
  <p>I want to define a sympy expression which contains the symbol "hbar" which will render as the physics symbol.</p>