The Language of Espionage: Signs, Countersigns and Recognition
https://www.itstactical.com/intellicom/tradecraft/the-language-of-espionage-signs-countersigns-and-recognition/
WEBAug 11, 2015 · Recognition Signals. There are two types of recognition signals, near and far. However, when it comes to near recognition, you’ve got both audio and visual near recognition. I’ve actually been talking about audible (spoken) near recognition signals the entire article thus far. Near recognition signals are both signs and countersigns, as ...
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