The Code Cube is a cube with some of the instruction code for the robots imprinted on it. There are probably several, but only one has been seen and is under Katerina Donlan's possession, this one was her key to understanding how the Robots work.
Acording to the Robots, their coding cannot be represented outside of conceptual space without being written on a cube such as this.
The coding was written in a language not designed for humans. Despite this, Kat is able to read some of it.
List of Appearances
- Cover of Gunnerkrigg Court Volume 4: Materia