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It is a routing protocol. It stands for Asynchronous Transfer Mode. Or an Automatic Teller Machine - usually called a cash machine in the UK.
Automatic
Teller
Machine
It is a card used to access your bank account from an automatic teller or cash machine.
ATM
If by ATM you mean "Automatic Teller Machine" , then the plural would be ATMs ("Automatic Teller Machines" )
First electronic automated teller machine is discovered by De La Rue