What is the red button on a keyboard? : r/whatisthisthing

WITT, Found this fake key thing at work, I can't seem to find any way to open it or anything like it on the internet. : r/whatisthisthing

Computer Keyboard Rocker Mouse Pointer Point Stick Keyboard, 58% OFF

Trump and Kim Jong Un's nuclear button rhetoric has a long history

Antique telecommunications device with keypad, speaker, and printout found at shop with a note attached : r/whatisthisthing

Does anyone know what this black button is/does? It has a Velcro back and an on/off switch and clicks when pressed. : r/whatisthisthing

Red Button `Learn` on Keyboard Stock Photo - Image of internet, finger: 182575850

What are these little white things that hold my keyboard keys in place? : r/ whatisthisthing

What is the red button on a keyboard? : r/whatisthisthing

Can someone give me a description of how this typewriter's keys may function? : r/typewriters