"Stereoscopic imaging or 3-D (three-dimensional) imaging is any technique capable of recording three-dimensional visual information or creating the illusion of depth in an image"
Stereoscopic 3D describes a 3D effect created by combining a two separate (left and right) images, like stereo sound describes 2 channel audio. As far as I know, all artificial 3D effects are created by stereoscopic means. All 3D media projects two images and use some trick to make sure each eye sees the correct image to create the illusion of 3D. At the theater the glasses filter the images so your left eye can only see the left picture and your right eye can only see the right picture. Home TV 3D is a little different, they flash the left image, then the right image rapidly while the fancy glasses syncronyze with the picture to only let the correct image through, like an eye patch waving rapidly in front of your face. The 3DS uses a fancy trick I dont quite understand but it has to do with polorized light, like when you get polorized glasses that can see through glare on glass or water.
Long story short, Stereoscopic doesent mean anything fancier than regular old 3D until you get into how it works specifically for each kind of technology. I dont think categorizing 3D as stereoscopic or not will be important until there is something that gives 3D without having to use 2 separate images (holograms maybe?). It is kind of like saying "a winged airplane" as far as I know ther is nothing we would call an "airplane" without wings, so the distinction is meaningless.
I'm pretty sure the OP was asking because they print it on the back of most 3DS boxes as one of the game's features.
Interestingly, not every 3DS game will necessarilly utilize stereoscopic 3D. In Pac-Man & Galaga Dimensions, one of the games on the cart, Pac-Man Tilt, will not have 3D. So, there might be other game developers that choose not to use 3D in their games. Hopefully, not too many abandon it though - it's kind of a big selling-point.
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