Unrelated business income tax is a tax on all income earned from an unrelated business activity, minus tax deductions as a result of producing that income. It is a trade or business. This includes any activity carried on for the production of income from selling goods or performing services.
The power button is a round or square button that powers an electronic device on and off. Nearly all electronic devices have power buttons or power switches. Typically, the device powers on when the button is pressed and powers off when the button is pressed again. A hard power button is mechanical - you can feel a click when pressed and usually see a difference in depth when the switch is on versus when it's not.
Wii remote has a d-pad, 1 and 2 buttons, and the A button, then B as an awkward shoulder button, then plus and minus buttons. Joycon has a clickable analog, four face buttons, two shoulders, and a single plus or minus button. The Joycon only has two more buttons when you include the plus and minus buttons. I guess that's quite a few more buttons considering a typical controller only has twelve buttons, but still.