aptotic
1. Did you know, there is a same, aptotic, precise token hidden on the banknotes' pattern of all over the world, for computers to detect as a "label" or "signature".
你知道么?全世界各国的纸币图案上都隐藏有一种相同的、固定的、精确的、用于计算机检测的“标记”或者“签名”。