The Assembly Number 2 4622 sign will be displayed at a site that has been designated as assembly position 2. People are usually pre-allocated their assembly point numbers beforehand and should know to head to this point in a drill or emergency.
It is important that you know that people on your premises are out of danger, during an emergency, and this sign will reassure you of this. As it is photoluminescent, it will glow in the dark.
Fixing requires anything as simple as sticky pads, 'No-nails' type adhesive or double-sided tape.