Una peonza es un cuerpo que puede girar sobre una punta sobre la que sitúa su centro de gravedad de forma perpendicular al eje de giro, equilibrándose sobre un punto gracias a la velocidad angular, que permite el desarrollo del efecto giroscópico. De múltiples formas y variando su funcionamiento existen numerosos tipos de peonza: trompos, perinolas, spun, dreidel, snurra, levitrón, beyblade.

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A spinning top is a toy designed to spin rapidly on the ground, the motion of which causes it to remain precisely balanced on its tip because of its rotational inertia. Such toys have existed since antiquity. Traditionally tops were constructed of wood, sometimes with an iron tip, and would be set in motion by aid of a string or rope coiled around its axis which, when pulled quickly, caused a rapid unwinding that would set the top in motion. Today they are often built of plastic, and modern materials and manufacturing processes allow tops to be constructed with such precise balance that they can be set in motion by a simple twist of the fingers and twirl of the wrist without need for string or rope.

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