Gyro
Gyro is the name for R.O.B.'s Down Special Move in Super Smash Bros. Brawl. The attack is a spin toy that R.O.B. fires. It is somewhat chargeable; the longer you charge it, the stronger and faster it becomes. A fully charged Gyro normally does 18% of damage, and has high knockback. After you throw it, you can pick it back up and throw it at the opponent doing 10% of damage. Each R.O.B. player can only have one originating gyro on the screen at any time, and a R.O.B. can use Gyro again as soon as the previous gyro leaves the screen. If R.O.B. cannot reuse his gyro, he goes into his Gyro-charging stance and makes a motion with his arms as if to spin a gyro, but no gyro appears. The "Gyro" is like Donkey Kong's Giant punch, when it is used, it begins to charge, it doesn't atack instantly.
The "Gyro" is essentially a spinning top. The R.O.B. accessory for the Nintendo Entertainment System was able to spin up gyros and use them to press buttons to activate in-game effects for the game Gyromite; the button would remain pressed only as long as the gyro retained enough speed to remain upright.
R.O.B.'s Gyro symbol's design is incorporates the symbol for The Subspace Emissary.