You must be referring to an autistic savant. Basically, its an autistic person who has savant syndrome.
Autistic savants
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And You Know Who You Are - 2012 Are You an Idiot Savant 1-15 was released on: USA: 15 September 2012
Someone who is autistic but with a special talent or ability.
An idiot savant is a mentally defective person with an exceptional skill or talent in a special field, as a highly developed ability to play music or to solve complex mathematical problems mentally at great speed. Some indications of idiot savant are that one might be good in a special field but does dumb things at the same time.
First, I suggest reading "Born on a Blue day" by Daniel Tammet. The author is Autistic Savant and the book is about his experience with the syndrome. A definition from MedicineNet.com is: Autistic savant: A person with autism who is exceptionally gifted in a specialized field. That field may, for example, be mathematics. The autistic savant may be able to do rapid, complex mental calculations. Or the field may be music. The autistic savant may be able to perform a entire piece of music after hearing it only once. The term "autistic savant" has replaced the old term "idiot savant," which is perjorative and imprecise. A savant (from the French savoir, to know) is a sage, a learned person.
Dean Savant's birth name is Dominick Savant.
Doug Savant's birth name is Douglas Peter Savant.
Carlos Savant is 5' 6".
Savant - Wildstorm - was created in 1995.
Savant Young was born in 1976.
Idjit Savant was created in 1994.
Cowboy Savant was created in 1999.
Doug Savant is 5' 10".