Tailor's awl, non-slip, ergonomic and wonderfully sharp.
Poke holes in leather, fabric, etc.

When do you need that?
For example, to put on a buckle, the thorn (that is the rod that goes through the hole) must go through the fabric. Or when using printers, the destructible ones such as the Anorak printers or decorative staples in jeans, etc.

Also for English embroidery, also called Broderie Anglaise, hole embroidery or open white work