This number, CUSIP number, is a number that identifies any security.

USIP代码是所有美国股票及注册债券的编号由美国统一证券辨认委员会管理,用于区别每一项证券

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So every security has an identical CUSIP, which identifies it.

同样,每种证券都有CUSIP号用于区分

耶鲁公开课 - 金融市场课程节选