The long buttons on devices, such as remote controls or smartphones, are typically referred to as "sliders" or "sliding buttons." However, in specific contexts like user interface design, they may also be called "toggle buttons" or "slide controls." These buttons allow users to adjust settings or navigate options by sliding or pressing along a longer surface.
buttons buttons buttons
A group of related buttons is called a panel or a bank.
If you have buttons on a tab, it could be called a group of buttons. It you have multiple tabs with buttons, you have a group of tabs.
Buttons are sewed onto cloth
The buttons on a trumpet are called valves.
powerpoint buttons
A sweater that buttons up in the front is called a cardigan.
The keypad.
keys
More then likely they are just called keys
Simon says
It's called Koumpounophobia.