6 secret code systems that help prevent mass panic
Sep 8, 2016, 18:30 IST
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If you need to keep people safe in a time of crisis or emergency, the best thing to do might be to keep them in the dark about what's going on.
When police, hospital staff, and other institutions or organizations have to communicate with each other without sending the public into a panic, they use secret codes to tell each other what's happening.
Here are a few of them.