It is simply a normal playing die: with numbers 1 to 6 on its faces.
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a cube, or a six sider, or a die, much like the ones used in yahtzee!
1 in 1296
1/6^3
1/1296 (0.07716%)
It is 6*6-5 = 6-4 = 1/1296 = 0.00077 (approx).