p>
                6.28318
              </p>
            </td>
<td>
              <p>
                Many uses, most simply, circumference of a circle
              </p>
            </td>
</tr>
<tr>
<td>
              <p>
                tau
              </p>
            </td>
<td>
              <p>
                τ
              </p>
            </td>
<td>
              <p>
                6.28318
              </p>
            </td>
<td>
              <p>
                @https://en.wikipedia.org/wik