What is the full form of "AMEX"?

The American Express Company (AmEx) is a multinational financial services corporation headquartered at 200 Vesey Street in the Battery Park City neighborhood of Lower Manhattan in New York City. The company was founded in 1850 and is one of the 30 components of the Dow Jones Industrial Average. The company's logo, adopted in 1958, is a gladiator or centurion whose image appears on the company's well-known traveler's cheques, charge cards, and credit cards.