It\'s a Triforce Necklace, now with 3 versions!
The original is the main picture and I added two more when I saw that people were actually printing it. The other two incorporate the necklace loop differently.
There is one with a rectangular through hole as part of the Triforce shape and the other has a loop attached to the top like the original, but it faces left-right so that the necklace will face the correct direction when you have it around your neck!
Print, add a chain, wear to ward off Ganon/Ganondorf. Originally created in NX5, newest versions were created in Solidworks.