The No Exit 8120 sign has the symbol for a hand on the top, which will be recognisable by people as an instruction not to go any further. The written instruction is situated below.
You should display this sign clearly alongside the exit from a building. Otherwise, people will presume that they are permitted to leave the premises through the door. The sign will glow in the dark, as it is Jalite AAA photoluminescent.
Fixing requires anything as simple as sticky pads, 'No-nails' type adhesive or double-sided tape.