This dagger is replicated from the Daedric dagger in a very popular role playing game Skyrim. You might have heard of that game, I believe it is somewhat popular and has a following of sorts amoungst the youth. The Daedric Dagger is a one-handed weapon that appears in The Elder Scrolls V: Skyrim. Similar to the sword, this dagger has a serrated edge. It also has the curved handle unique to Daedric weapons.
So you might remember that chap with the impossible sounding name 'Vin Deisel' who spends altogether too much time driving his cars in what can only be termed an anti-social manner, of and he did a couple of Sci=Fi movies (which do not make up for that stinker XXX) From the Movies 'Pitch Black' & 'The Chronicles of Riddick' comes the nifty blades that Riddick always carried to good effect.