SHODAN was a sentient, artificially intelligent computer in the computer game
System Shock. While SHODAN originally stood for Sentient Hyper-Optimized Data Access Network, the name gradually took on greater overtones.
SHODAN was the villain of System Shock, as was one of the best villains computer gaming has ever seen - ruthless, capable, arrogant. She tended to speak in a pleasant, motherly voice that was broken up in a stutter, as if she had trouble dumbing herself down enough to be able to communicate with humans.
A quote: "Look at you, hacker. A pathetic creature of meat and bone, panting and sweating as you run through my corridors. How can you hope to defeat a perfect, immortal machine?"