3-D or 3D abbreviates "three dimensional" and is often related to a stereoscopic display that exploits binocular vision.

Three dimensional objects have volume and may be measured and described using three orthogonal directions.

In animation, 3-D sometimes refers to shaded, modeled shapes that have an appearance of depth, as opposed to the "flat" rendering of conventional cel animation. An example of this was seen in a particular episode of the animated video cartoon The Simpsons, where Homer escapes his flatland-like world and enters a universe of higher dimensionality. The figure renderings and visual effects in this episode were accomplished using 3D computer graphics.

See the following articles:

• For 3-D mathematical aspects see dimension.
• For 3-D image information see stereogram
• For 3-D image production and display information see stereoscopy
• For 3-D computer graphics and related software see 3D computer graphics.
• For 3-D movie history see 3-D film.

3D is also the stage name of British artist and musician Robert Del Naja.

3D/Biela is Biela's Comet