stylet

noun5

1. •
   A slender medical probe or device.
2. •
   A style of a plant's flower.
3. •
   A stiff, slender organ of an animal.

   • Even octopuses without stylets almost certainly retain the molecular machinery necessary to build them. — 2017
4. •
   An engraving tool, a stylus.
5. •
   A poniard or stiletto.