This is the Hylia Shield from the Legend of Zelda series. TheMustacheHero and I actually had this idea before the skin for the regular razorback LoZ shield was made, so don't say I stole it.
I modeled the shield using a reference from a ripped version from Twilight Princess. If you think I just used the ripped version, I can send you a picture of the wireframe if you really want to argue. >_>