I'm kind of curious about the origins of some of the other ones too. The game boy color is CGB, which makes sense (Color Game Boy), the game boy advance is AGB, which makes sense (Advanced Game Boy), the GBA SP is AGS, clearly a derivative of AGB, the wii is RVL from its development codename Revolution, but why is the DS NTR? Why is the DS lite USG? Why is the 3DS CTR? Why is the New 3DS KTR? What's the P in the Wii U's WUP?