The Stairway Level C 4873 Sign will notify people of the fact that they are now on this level. It is always a good idea to ensure that you clearly mark out the different levels in a building and this sign helps you to do just that. Use a different sign for each level accordingly.
The sign would glow in the dark, if lights went out, as it is Jalite AAA photoluminescent. This could be a very important bonus feature, especially in a time of crisis.
Fixing requires anything as simple as sticky pads, 'No-nails' type adhesive or double-sided tape.