3D

"3D", occasionally spelled "3-D", was an undefined trait that Martha Jones, in 6012, attributed to a three-dimensional map on Messaline. (TV: The Doctor's Daughter)

By the early 21st century, televisions were capable of 3D broadcasting. (PROSE: Cat's Cradle: Warhead) A revolutionary camera developed by ElysiuMatics in 2007 was capable of taking 3D holographic images that appeared alongside text in newspapers. (PROSE: Iceberg) By 2109, most children had access to graphic programs, on which they would create things like trains with basic three-dimensional shapes like cones and cylinders. (PROSE: Transit)

As of the 27th century, some "vidgames" were in 3D; a hostess once offered the Tenth Doctor a "modem link for 3D vidgames." (TV: Midnight) By 4123, tickets were in 3D as well; Solana Mercurio once gave visitors to the Ood Sphere what she referred to as "3D tickets." (TV: Planet of the Ood)

Living Vision 3DTVs designed and marketed by Walter J. Matheson III were in 99% of the homes of 101st century New Earth Republic. They looked like flat discs, and displayed images in the air much like a hologram. The TVs functioned by "extruding plastic" to display three-dimensional television programmes. (PROSE: Synthespians)

The Tenth Doctor used a pair of 3D glasses when observing the effects the Void had on people and objects. (TV: Doomsday)

Behind the scenes
A trailer for the fifth series of Doctor Who was released in 3D, in cinemas and on YouTube, on 20 February 2010.

On 23 November 2013, The Day of the Doctor was released in cinemas in 3D, in celebration of Doctor Who's 50th anniversary. The special was subsequently released in 3D on Blu-ray on 2 December.