From design site Chormoly:
Ninja Tacks are thumbtacks designed to give the illusion that throwing stars are embedded in a surface. This product is an informal
re-imagining of an often overlooked essential office tool.
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When I was about 10 years old my dad, in his ongoing blindness to the fact that I am a girl, fashioned me a razor sharp metal throwing star on his table saw. Over the next few weeks he showed me how to use it, adding to my arsenal of the bow and a Little John-esque staff.
And I wonder why no boys kissed me till I was 15.