What follows is a list of unusual or interesting items — objects, devices, machines, etc. — that can be found on the D'ni Ages as described in the various Myst franchise games and novels. Most concern technology that was unique to the D'ni themselves.

Culture

Games:
- Ahyoheek
  - Ahyoheek is a game table found in public places inside many D'ni neighbourhoods. It is a game for two or more players which has some similarity to Rock, Paper, Scissors. It is played on a special pentagonal table with electronic scorekeeping and holographic display built in. The three "throws" are Pen, Book, and Beetle; Pen writes in Book, Book crushes Beetle, Beetle provides ink to Pen. It is played by 2 to 5 people simultaneously, each person sitting at one side of the table. Each side of the table has a concealed panel of three buttons, each corresponding to a throw. A game of Ahyoheek consists of multiple rounds; the goal is to win three rounds with the same throw. A round begins with one person choosing his throw; other players must follow suit before a timer displayed in the center of the table reaches zero. At the end of a round, each player's throw is compared with each of the other players'. A player earns one round-point for each opponent he beats, and loses one for each opponent who beats him. The player(s) with the most round-points win(s) the round, and a panel of small lights indicates the throw with which they won. When at least one person has won three rounds with the same throw, the winners are declared.
- Gemedet
  - Gemedet is a two-player game quite similar to chess.
Imagers:
- Imagers, in the D'ni culture, were devices which somewhat resemble television screens. They could either display live data transmitted from a camera placed somewhere, or a series of static images (taken by a Ki or possibly even paintings). D'ni Imagers are found in most neighbourhoods, as well as in Ages, where they are sometimes used to display greeting notices or instructions.
- Other kinds of imagers more closely resembled hologram emitters. An examples is Gehn's Imager of his deceased wife Keta found in Age 233.
Timepieces:
- As the D'ni counted time differently than the surface dwellers, their watches and clocks were remarkably different. A D'ni day was divided 5 equal segments of 6 hours each, making for a 30-hour day. (30 hours, 14 minutes in surface time). One example of a D'ni watch can be seen on Aitrus' maps. D'ni alarm clocks/timers are found in various Ages, such as in Age 233. Larger clocks are seen in D'ni neighbourhoods.

Industrial objects

Mining devices:
- The Burrower
- The Cycler
- The Excavator
- The Grinder
- Old Stone Teeth
- Rock-Biter
  - These devices were immense machines, which were used to create tunnels that connected the diverse caverns that formed the D'ni empire.
- Fusion-Compounder
  - The Fusion-Compounder turned the tunnelled rock into highly compressed molecules, which were used to create the mining products below.

Mining products:
- Deretheni
  - Deretheni is a jet-black form of D'ni engineered stone. More mallable than Nara, the strongest Maintainer's Suits were created out of this.
- Nara
  - Nara is a highly compressed form of D'ni engineered stone, which is green-black in colour, and emanated a faint green light. It is approximately 300 times stronger than stone, and was used to structurally support D'ni tunnels.

Miscellanious

Related to the Art:
- Books
- Gateway Image
- Nexus Book Machine
- D'ni Ink

Maintainer technology:
- Great Zero:
  - The Great Zero Neutrino dispenser is a device which emanates neutrinos, which are used by the D'ni location markers.
  - Maintainer Marks are markers in other Ages, which are connected to the Great Zero in some way. They allow for position tracking and KI communication across Ages.
- Great Zero Markers are markers which can be "collected" with a KI. They play a r�le in calibrating the Great Zero.
- The Marker Dispenser is a device which can configure a KI to collect certain groups of Markers.
- KI
  - The D'ni KI is a handheld device developed by the D'ni shortly before the downfall of the D'ni empire. Its actual name is unknown: KI (pronounced 'key') is from the D'ni numeral 3, which somewhat resembles the letters KI. /it is unknown why the devices were all labelled 3. The KI served as a communication device for the D'ni, as well as a storage device for images, and a positioner using co�rdinates from the Great Zero and Maintainer marks. KIs could also be used to track and store markers.
  - The D'ni technology underlying the KI allowed for communication across the various Ages.
  - In Uru, it is learned that the DRC rediscovered the KI and managed to partially translate the devices so they could be used by DRC members and authorized explorers. The KI is needed to finish the Age of Gahreesen, and also plays a r�le in the puzzles in the first Uru Expansion Pack, To D'ni.
- Maintainer's Suits are the protective suits worn by Maintainers on dangerous missions, to untested or unstable worlds. They are created out of Deretheni rock.