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Signal 20

Police code for someone who is mentally unstable.
This one is a 20.

So and so is a signal 20
by Bill2310 May 4, 2018
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mugGet the Signal 20mug.

Signal 20

Personnel status check on a Fire ground or other emergency scene.
Command: " Unit 700 Signal 20". Unit 700: "Check".
by Dave720 October 18, 2021
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mugGet the Signal 20mug.
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