thumb|NSA photo of microdots taped inside the label of an envelope. The envelope was sent by Operation Bolívar|German spies in Mexico City to [[Lisbon during World War II, but was intercepted by Allied intelligence.]]
Article · 中文
微点(microdot)是摄影术语，专指出将文件通过精密光学摄影机缩小数百倍在极高分辨率的感光膜上形成如同句号点一般大小的影像。微点像经显微镜放大后，清晰可见[1]。第二次世界大战期间，常被国际间谍用作隐藏、传递秘密情报的手段。
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