A number of computer futurists use the term technological singularity (or, simply the word singularity) to refer to the time when computers become more intelligent than humans. Such futurists suggest that at the time of the singularity computers will move from being somewhat less intelligent than humans to being vastly more intelligent than humans.
Quoting from Technological Singularity in the Wikipedia:
The term [technological singularity] was coined by science fiction writer Vernor Vinge, who argues that artificial intelligence, human biological enhancement or brain-computer interfaces could be possible causes of the singularity. The concept is popularized by futurists like Ray Kurzweil and it is expected by proponents to occur sometime in the 21st century, although estimates vary.