A matryoshka oll (Russian: матрёшка, Russian pronunciation: [mɐˈtrʲoʂkə]) or a Russian nested doll (also called a stacking doll or Babooshka doll) is a set of dolls of decreasing sizes placed one inside another. "Matryoshka" is a derivative of the Russian female first name "Matryona", which is traditionally associated with a fat, robust Russian woman.