Genisys is the fictional operating system at the center of Terminator Genisys.
In the film, Genisys is presented as a widely adopted system designed to connect users and devices. Its launch is tied to the altered history created when the timeline changes, and the system becomes connected to the artificial intelligence that threatens humanity.
The title's unusual spelling distinguishes the film's fictional product from the ordinary word “genesis.” The story uses the operating system as a modern route for the machine intelligence to reach people through networked technology, updating the franchise's earlier focus on a military computer system.
Skynet remains important to the film's alternate timeline, but it is not the name of the consumer operating system advertised as Genisys. Coltan is a character's name in the film's broader story, not the operating system. These distinctions make the exact spelling significant.