rat line
n.— «The Bulgarian secret service, which follows KGB orders without question and which had long-established “rat lines” smuggling spies and arms into Italy and Turkey, was the obvious choice.» —“Did Andropov plot to intimidate Vatican?” by William Safire New York Times Dec. 17, 1982. (source: Double-Tongued Dictionary)
Further reading
Centuries ago, monks who took a vow of silence developed their own hand signs, with hundreds of gestures, that are still in use today. Plus, how do speakers of different languages distinguish similar shades and tints of colors such as red, yellow...
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