night writing
In an ahistorical way.
A system of code using symbols of twelve dots arranged as two columns of six dots embossed on a square of paperboard, designed to allow military communication without light or noise. It is the forerunner of braille.
present participle of potshot
plural of face mask
将軍は、厚紙に凸状に押された2列6点ずつの12点で表す符号体系（光や音を出さずに軍事通信を行えるもので点字の前身）を実演させ、前線でメッセージが静かに伝えられることを示した。
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