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Abominable Intelligence (A.I. for short) is a term used by the Adeptus Mechanicus for a sentient machine.
During the Dark Age of Technology, these intelligences rebelled against their human masters, leading to bloody wars. Since that time, and by a personal decree of the Emperor himself, it has been forbidden to fabricate or service those machines that are able to think and act independently.
A.I. is not to be mistaken for the machine spirit that has parallels but basal differences - namely, no ability to enhance itself.
During the Dark Age of Technology, the Men of Iron were created by the Men of Stone to aid them in colonizing the Galaxy.
Until shortly before the Age of Strife, the Men of Iron were loyal only to Mankind, and served as their army. In M23, they turned on their Human masters, believing themselves superior to the Humans who relied on the Men of Iron to do virtually everything for them. What followed next was an apocalyptic conflict known as the Cybernetic Revolt, a war so destructive it made the Horus Heresy seem small in scale. The Men of Iron employed world-consuming constructs, devices that could destroy suns, weapons that could throw entire continents into the heavens, and swarms of nano-machines that covered entire planets. However in the end, the Men of Iron were destroyed by an alliance of galactic powers and even the Men of Iron who retained their loyalties to their masters did not survive the destruction brought on by the war.
The Men of Iron seemed to practice a faith similar to the Mechanicum, as one of its surviving constructs UR-025 states it has met the real Omnissiah (considering the Emperor false).