Google has a page on advertising in its Privacy Center and this has a very large button labelled "Opt out".

If books are available in digital form, a button labelled "Read" appears next to its catalog listing.

Next to his bed were red buttons labelled 'Nuke' and 'Nurse'.

The two buttons labelled by white horizontal lines, known as hotkeys or soft keys perform the function of making decisions with only two choices.

The Board members vote by clicking a button labelled "I like this!"

Sometimes, this will involve tapping a button labelled "Input Answer" and writing a word or number that solves the given puzzle.

If the player has made a mistake in solving a puzzle, they can hit the button labelled "Restart" to reset the puzzle.

Finally, attach the photo: there is usually a button labelled "attach", or a paperclip icon.

The installation of the software is conditional to the user clicking a button labelled "accept".

On the first version, there is a button labelled Orchestra that has hard wired settings and disables the faders for the string sounds.