Rubik's cube
Concise Oxford English Dictionary © 2008 Oxford University Press:
Rubik's cube /ˈruːbɪks/
▶noun trademark a puzzle in the form of a plastic cube covered with multicoloured squares, which the player attempts to turn so that all the squares on each face are of the same colour.
– origin 1980s: named after its Hungarian inventor Erno Rubik.
'Rubik's cube' also found in these Oxford entries:

