What does it mean in the end NF

NF I would like to ask what does this mean in the end …
Thank you, the best detailed …………

two letters, you did not explain the problem clearly, he is two letters you have to ask where the expression is the type of card, NF is the graphics production equipment manufacturers NVIDIA motherboard chipset, in order to GPU graphics cards with the basic Gefore-named to distinguish, so named Nforce, the chipsets support AMD's CPU, the current mainstream products are Nforce4