"卡号"在英语中通常称为"card number"。
这个词的来源与信用卡、储蓄卡等银行卡有关，这些银行卡都有一个独特的数字编号，称为卡号，用来识别持卡人身份。
例句：
Could you please tell me your credit card number?
(请告诉我你的信用卡卡号好吗？)
The card number on the back of the debit card is where you enter the card number when making an onpne purchase.
(借记卡背面的卡号就是你在网上购物时输入的卡号。)
Please enter your card number in the field provided.
(请在提供的栏位中输入您的卡号。)