Many offices building as well as governmental offices and building have a piece of metal or PVC (usually golden or silvery but can be in any color) and it has the information about the working hours or other information such as the owner of the office the physician of this clinic etc. It's usually located near the door outside the buildings, for people to see the information about them.
How should I refer to it? What is this piece of metal called?
Based on my dictionary it's called sign or placard, but based on looking at google photos it looks like a mistake in translation.