CAS號(Chemical Abstracts Service)是美國化學文摘登記號，該號是用來判定檢索有多個名稱的化學物質信息的重要工具。

　　What is CAS?

　　A. CAS (Chemical Abstracts Service) is a division of the American Chemical Society. We are located in Columbus, Ohio. CAS is the producer of the largest and most comprehensive databases of chemical information. Our principal databases are Chemical Abstracts (CA) which contains over 23 million document records from the chemical journal and patent literature, and Registry which contains over 24 million substance and 50 million sequence records

　　CAS also operates the STN International online service with partner organizations in Europe and Asia. STN provides access to nearly 200 databases covering topics such as science, technology, patents, and business information.

　　CIQ: custom,immigration,quarantine, 海關 CIQ(CHINA ENTRY-EXIT INSPECTION AND QUARANTINE)中國出入境檢驗檢疫

　　PO=purchase order(客戶發給你的采購訂單),

　　PI=proforma invoice(你開給客戶的形式發票,相當于合同),

　　CI=commercial invoice(出貨之前要做的商業發票),PL=packing list(出貨之前要做的裝箱單).