Cube (Portal 2)
Cubes are portable objects in the Portal series. A cube can be placed on a button to activate it.
Various kinds of cubes exist in Portal 2. The standard cube changes color when it triggers a button. The edgeless cube acts the same, but is ball-shaped, and may be placed in a special button-receptacle. The pivot cube (also known as a redirection cube) can redirect a discouragement beam. The companion and underground cubes are themed, but functionally the same as the standard cube. Frakenturrets are also functionally the same, but under certain conditions will jump around.
Cube
prop_weighted_cube - The entity models/props/metal_box.mdl - The world model portal_weighted_cube - in game command line
There are also reflector cubes which can redirect env_portal_laser's