For 10 points, name this last-in, first-out data structure.
Reverse Polish notation uses this data structure for memory storage. The language PostScript is said to be oriented to these data structures, which are not found in Python because, in that language, two of this structure's key operations can be implemented on any list. These restricted data structures, which were first proposed by Frederich Bauer, are typically implemented through a singly linked list or through a to-do box. To add or remove data to these structures, the "push" or "pop" operation can be used. For 10 points, name this last-in, first-out data structure.
Reverse Polish notation uses this data structure for memory storage.
stacks