A question from Yahoo! Answers:

How are those russian dolls that look like eggs called?
And more little dolls smaller and smaller go stored in them???

They are called “matryoshka” (singular) or “matryoshki” (plural). But they are not really Russian. The first set of “matryoshki” was manufactured in Sergiev Posad about 1895 based on a Japanese toy depicting a Buddhist sage called Fukuruma, his wife, and their numerous children…