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To most people, code words indicate a fun mystery. But for the police, doctors, and emergency responders, code words let them know what they’re about to deal with.

And some of the words below are so useful for the people who work in dangerous occupations that they’ve become widely known.

Let’s go through 10!

10. 7500

Pilots are trained to say this number if their craft has been hijacked.

9. Code Blue

Hospitals tend to have different code words, but code blue generally indicates a patient who has gone into cardiac arrest.

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8. Code Oscar

The military uses this code whenever a man has gone overboard.

7. Code Bravo

If you hear this at an airport, it means a bomb threat exists or security has been breached.

6. Code Silver

Hospitals use code silver to denote a violent threat, hostage situation, or other incident requiring lockdown.

Yikes!

5. Echo, Echo, Echo

Ships use this code when two of them are about to crash into each other or when winds are high.

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4. Pan-Pan

This is code for problems on a ship, airplane, or another mode of transport.

Thankfully, it doesn’t mean anything violent is happening.

Usually, it’s an engine issue or mild leak.

3. Inspector Sands

London authorities use this code whenever there’s a bomb threat or possible fire in their underground or railroads.

Photo Credit: Wikipedia

2. 10-33

Police departments often use this code when there’s an emergency.

1. Dr. Firestone

Hospitals use this if there’s a fire underway.

Hopefully, you’ll never be in a situation where you have to hear or use these codes yourself.

There are many other emergency codes besides these, but do you know any of them? If so, share them in the comments!