A cube was a three-dimensional solid object bounded by six square faces with three meeting at each vertex.
Sugar, a natural Earth sweetener, was sometimes compressed into cube form for ease of use. Tango, one of two horses owned by Christopher Pike, enjoyed eating sugar cubes. (TOS: "The Cage")
Balok used a cube-shaped buoy to study the reactions of the USS Enterprise NCC-1701 crew in 2266. (TOS: "The Corbomite Maneuver")
A common Earth die is an example of a cube. In 2365, while trapped in a re-creation of the Royale Hotel on Theta VIII, Commander Data stated that the "cubes [were] improperly balanced" when referring to the craps dice. (TNG: "The Royale")
The holographic James Moriarty and Countess Regina Barthalomew were stored in a cubic enhancement module with enough active memory to provide them a lifetime of experiences. (TNG: "Ship in a Bottle")
When asked by Vic Fontaine if he knew what a square was, metaphorically speaking, Odo defined literally it as "one side of a cube". (DS9: "His Way")
The Borg cube was the primary starship of the Borg Collective, and measured 28 cubic kilometers in volume. The Borg also used specialized tactical cubes for heavy combat. (VOY: "Dark Frontier", "Unimatrix Zero")
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