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					Originally Posted by Atlantia
					
				 Well, for sure the vast majority of daggers are knives, and some knives are daggers    
Dictionary definitions seem fairly similar: 
'Short pointed knife: a short pointed knife used as a weapon' (Encarta) 
'Stabbing weapon with short pointed and edged blade' (Oxford)
 
Obviously the item in question IS a knife, but to me it goes without saying that it's a dagger also. 
So either designation is technically correct in my view. | 
	
 This "piece" has one cutting edge. Therefore it is a knife, not a dagger.