Supernumerary digits located at the ulnar side of the hand (that is, on the side with the fifth finger). The phenotype is Postaxial hand polydactyly (HP_0001162, a Human Phenotype Ontology identifier). Also known as: Extra little finger, Extra pinkie finger, Extra pinky finger, Polydactyly affecting the 5th finger, Postaxial polydactyly of fingers, Postaxial polydactyly of hand, Postaxial polydactyly of hands.