The second (non-advert) result from google was http://www.cooking.com/products/shprodde.asp?SKU=212449 which is selling the Rosle Stainless Steel Bar Knife and the description includes "The two prongs at the tip are perfect for picking up segments after they're cut."
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branchandroot
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Date: 2007-04-20 10:22 pm (UTC)http://www.cooking.com/products/shprodde.asp?SKU=212449
which is selling the Rosle Stainless Steel Bar Knife and the description includes "The two prongs at the tip are perfect for picking up segments after they're cut."
So, basically, the same reason as a cheese knife.