        </td>
<td>
            </td>
<td>
            </td>
</tr>
<tr>
<td>
              <p>
                pi
              </p>
            </td>
<td>
              <p>
                π
              </p>
            </td>
<td>
              <p>
                3.14159
              </p>
            </td>
<td>
              <p>
                Ubiquitous. Archimedes constant <a href="http://en.wikipedia.org/wiki/Pi" target="_top">π</a>.
                Equivalent to POSIX constant M_PI
              