Trick question, Amy--- all of them are... just like a rock, a pair of scissors, a plastic bag, a strand of piano wire, a tire iron, a candlestick, etc. Anything one can use to "assault" another with is an "assault" weapon. I wish the Left would stop changing the language to suit its needs/agendas. More so, I wish people would stop buying into the semantics game, and demand proper clarity. If the gun control crowd means "fully automatic" weapons they should say so (which, are already restricted, heavily). If they mean "assault" weapons, they need to be prepared to have their home versions of the game "Clue" taken away from them, as well as pretty much everything else than could be used as an "assault" weapon, including digits and/or limbs.