thumbstick

• https://en.wikipedia.org/wiki/Analog_stick

“…used for two-dimensional input. An analog stick is a variation of a joystick, consisting of a protrusion from the controller; input is based on the position of this protrusion in relation to the default “center” position.”

• source: https://en.wikipedia.org/wiki/File:GameCube_Analog_Stick.jpg
• source: https://en.wikipedia.org/wiki/Analog_stick