Relating to three-dimensionality / three-dimensional space:
3-D computer graphics, computer graphics that use a three-dimensional representation of geometric data
3-D film, a motion picture that gives the illusion of three-dimensional perception
3-D modeling, developing a mathematical representation of any three-dimensional surface or object
3-D printing, making a three-dimensional solid object of a shape from a digital model
3-D television, television that conveys depth perception to the viewer
Stereoscopy, any technique capable of recording three-dimensional visual information or creating the illusion of depth in an image