Six fingers on each hand
The man in the image above has a condition called Polydactyly, which involves people being born with extra fingers or thumbs.
Ulnar dimelia, also referred to simply as Mirror hand, is a very rare congenital disorder characterized by an absence of radial ray, duplication of the ulna, duplication of carpals, metacarpals, phalanges and symmetric polydactyly. In some cases, surgical amputation is performed to remove the duplicate carpals, metacarpals, and phalanges. Approximately 70 cases as of 2015 have been recorded in medical literature, According to Wikipedia.