It is a carving fork because it is used with a carving knife to hold the meat while you are carving with the knife and getting pieces out of it.

Typically, two.

A berry fork or a carving fork. Also a disposable two pronged fork can be known as a cheese fork or a chip fork

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One can find an electric carving fork at walmart or shopko. For higher quality products, try HSN. For used electric carving forks, look on Amazon and purchase one from another user.

mostly for holding food whilst your carving it with a knife. Or to roast larger meats.