A note with half the value of a demisemiquaver. One sixty-fourth of a semibreve. That is, a hemidemisemiquaver is a sixty-fourth note.

                      ___                   ___
       |             /###\                 /###\
       |\           |#####|               |#####|
       | \          |\###/                |\###/
       |\ )         |                     |
       | \          |                     |
       |\ )         |                     |
       | \          |                     |
       |\ )         |                     |
       | \          |                     |
   ___ |  )         |_____________________|
  /###\|            |_____________________|
 |#####|            |_____________________|
  \###/             |_____________________|

Yes that's four tails.

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