Cardona found a button marked "B," knew that it meant the basement floor.
Dude pressed a button marked "B"; the descent ended when they reached the basement.
It looked kind of complicated to operate, but then she saw the button marked "automatic," and switched to that setting.
I must have these buttons marked.
She watched him press the button marked "20" and waited as the doors slid soundlessly closed.
(The button marked A on the artist's sketch.)
A character test: Do you hit the button marked "close door" or "open door"?
They went into a small elevator car, and Ken pushed a button marked '3'.
I summon an elevator, press the button marked "4" and proceed to the top floor.
A button marked with a little picture of a car.