In emergency situations, 'B' signifies what command?

In emergency situations, the command that signifies 'B' is the "Brace command." This command is crucial because it instructs passengers and crew to assume a protective position in preparation for impact. The brace position is designed to minimize injury during an emergency landing or crash, enabling individuals to secure themselves in a way that reduces the likelihood of harm from sudden deceleration or collisions.

The effectiveness of the brace command hinges on the quickness and clarity in its delivery, as it relies on the crew's ability to gain the passengers' immediate attention and ensure their safety in a critical moment. Recognizing this command is vital for all personnel on board, as it can significantly enhance the chances of safety for everyone involved.