How to designate a stop button on a flowchart?

Question

block diagram

Hello.
The question is very stupid but needs a solution. There is an installation in which there are start and stop buttons, I don’t understand which block and where to place it on the block diagram.
The start and stop buttons can be marked with a rectangle, but I have no idea where to place the stop button, the stop button can stop the installation at any time, and this causes difficulty.
Help me please.

Answer 1

Is this option not suitable?
Button -> block "If pressed" -> "yes" arrow to the end of the program