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) When shown Gallifrey Falls No More, Clara Oswald noted that Time Lord stasis cubes resembled 3D paintings. (TV: The Day of the Doctor)

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)

Doctor Who in 3D
On the nights of 26 November and 27 November 1993, a Children in Need special Dimensions in Time, which also served as a Doctor Who 30th anniversary special and crossover with EastEnders, aired in 3D on BBC1.

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.

In a short introduction exclusive to the 3D theatrical release, the Eleventh Doctor thinks it's the 100th anniversary, and is disappointed to find that the special's being shown in only 3D, and not 12D — "Budget cuts?" In the same short, the Tenth Doctor joked about the Eleventh's chin being magnified in 3D, and Eleven quipped about Ten's wrinkles.