Amex is the everyday short name for American Express, a big US company. It is best known for its charge cards and credit cards — plastic you use to pay, then settle the bill later — and it also does travel and other financial services.

Amex is the everyday short name for American Express是「American Express」（美國運通）日常的簡稱, a big US company是一家美國大企業。It is best known for its charge cards and credit cards最有名的是它的簽帳卡和信用卡 — plastic you use to pay, then settle the bill later也就是先刷卡付款，之後再結清帳單的那種卡片 — and it also does travel and other financial services也經營旅遊和其他金融服務。

People say “I paid with Amex” or “Do you take Amex?” Shops sometimes put Amex on the door next to Visa and Mastercard.

People say 'I paid with Amex' or 'Do you take Amex?'大家會說「I paid with Amex」或「Do you take Amex?」（你們收美國運通卡嗎？） Shops sometimes put Amex on the door next to Visa and Mastercard店家有時候會把 Amex 的標誌貼在門口，跟 Visa 和萬事達卡並排。

American Express is the full, more formal name; Amex is what you say in speech and in quick writing. Write it with a capital A.

American Express is the full, more formal name「American Express」是完整、比較正式的名字; Amex is what you say in speech and in quick writing「Amex」是口語和快速書寫時會用的說法。Write it with a capital A開頭的 A 要大寫。

Though actually, AMEX in all capitals was also used for the American Stock Exchange, a different thing that happens to shorten the same way. In a café or a wallet, Amex means the card company.

Though actually不過話說回來, AMEX in all capitals was also used for the American Stock Exchange全部大寫的「AMEX」以前也用來指美國證券交易所, a different thing that happens to shorten the same way是完全不同的東西，只是剛好縮寫成一樣的字。In a café or a wallet, Amex means the card company但在咖啡店或錢包的情境裡，Amex 指的就是這家卡片公司。