the.com/matryoshka

means A traditional Russian nesting doll, carved and painted so that each hollow figure opens to reveal a smaller one inside, down to a tiny solid doll at the center — also used figuratively for anything structured in layers-within-layers.

from The name comes from 'Matryona'/'Matriosha', a common Russian peasant woman's name derived from the Latin 'mater' (mother) — fitting for a doll literally full of smaller selves. The toy itself emerged in the late 19th century, often credited to craftsman Vasily Zvyozdochkin working from a design by Sergey Malyutin at a Moscow folk-art workshop, reportedly inspired by Japanese nested figures brought back from abroad. So the doll's 'Russianness' is itself a kind of nesting: a native name wrapped around a possibly borrowed idea.