A Matryoshka doll is a set of dolls of decreasing sizes placed one inside the other. Matryoshka may also refer to: Arts, entertainment and media Matroesjka's, a Belgian television series Matryoshka (album), an album by Belarusian rock group Lyapis Trubetskoy Matryoshka (play), a Persian-language satire Matryoshka Radio, a Russian-language radio station broadcasting in the United Kingdom "Matryoshka", a song by Nico Touches the Walls from the album Passenger Matryoshka Doll, a special grenade featured in the video game Call of Duty: Black Ops Gemstone Matryoshka (diamond), a unique diamond with another diamond moving freely inside was mined in Yakutia at the Nyurba mining and processing division of Alrosa Science and technology Matroska, a video container file format, in computing Matroshka experiments on the International Space Station, assessing cosmic radiation doses for space travellers Matrioshka brain, a hypothetical computer surrounding a star See also Russian Dolls (disambiguation)