Stack. You can use variables of the stack type for working with stacks. The stack type is inherited from the arr type. So, you can also use methods of the arr type.
|stack.pop||Extracting an item.|
|stack.popval||Extracting an number.|
|stack.push||Add an item to a stack.|
|stack.top||Get the top item in a stack.|
|stack||The main structure of the stack.|