Recall signal is a standard procedure in military or emergency service settings. It's a signal initiated by the Senior Patrol Leader (SPL) to signify the end of a drill or activity, bringing everyone involved back together. This signal ensures that Scouts are aware that the drill or activity has concluded and it's time to return to their designated duties or areas. It's a crucial part of maintaining order and coordination within the Troop, especially in situations where prompt action or communication is essential.