Your birthday and social security number is what you look up.

你的生日和社保号码才是你应该查的

耶鲁公开课 - 基础物理课程节选

It's like you have a social security number or other ID number, which positively--there might be another person with the same name as you, God forbid, but you at least have your own number, which is guaranteed to be unique to you.

就好比社保号,或者其他身份号码,很有可能,有另外一个人,和你重名,希望这不要发生,但你至少有唯一的识别号,用于区分自己和他人

耶鲁公开课 - 金融市场课程节选

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

耶鲁公开课 - 金融市场课程节选