I use these codes for the site's filing system. I will give a quick run through of what I've found out they stand for and give you some regional variations:
NES - Nintendo Entertainment System. In Japan the Famicom's code is HVC, or Home Video Console.
SNS - Super Nintendo System. In Japan the Super Famicom's code is SHVC. I'll let you work that one out.
DMG - Dot Matrix Game. This is, of course, the Game Boy. The Game Boy uses dot-matrix technology.
VUE - Virtual Ultra Eye. Picked this odd name up from a Japanese website. Apparently this was a working title for the Virtual Boy.
NUS - Nintendo Ultra Sixtyfour - Some of us may even remember the old "Ultra 64" logo from the N64's promotional material. Ahh sweet.
CGB - Color Game Boy. Easy enough.
AGB - Advanced Game Boy. Again 'nuff said.
DOL - Dolphin. This was the working title for the Gamecube. Many latter-day N64 games make allusions to dolphins, as do many Gamecube games.
What could the rest of these Game Boy ones stand for?
GBD - Game Boy Dream (Lame), Game Boy Dancing (!?)
GBE - Game Boy Evolution (Suggested, good)
GBN - Game Boy Nintendo (Yawn), Game Boy Nooninoo (Whee!)
DGB - Doctor Game Boy (For all your medical needs)
EGB - Exciting Game Boy (duh), Extraterrestrial Game Boy (Ooooh)
TGB - Titillating Game Boy (matron!), Test Game Boy
WGB - Wacky Game Boy (I want one), Wario's Game Boy (give it back)
XGB - X-Game-Box (Err...), Xtreme Game Boy (I didn't know NST was into naming consoles!)
That was fun, let's do it again some time.