A button

The A button on various controllers. From left to right: N64, NGC, Wiimote, CC

The A Button refers to the large, green button on the GameCube controller, the large, blue button on the Nintendo 64 controller, the large, clear button on the front of the Wiimote, or the small, clear button towards the right of the Classic controller. In SSB and SSBM, it activates the Normal Attacks, which include smash attacks, tilt attacks, neutral A, dash attacks, and aerial attacks.

In SSBB, it activates normal attacks on the Wiimote/Nunchuck and GameCube controller configurations.