Double ended queue
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The magazine of a gun holds the bullets. Most magazines are single stack - each bullet directly above the next. Double stack magazines have 2 rows of bullets, slightly staggered.
A double stack system is where you have the main soil stack to carry away toilet waste (Generally). With a separate pipe taking waste water from a Shower/Bath/Basin to an outside gully leading to a sewage drain (maybe via guttering on your property). Not a common system on new builds but still found on pre 60's plumbing.
You can determine symmetry of a data structure in two ways. One is when the stacks and queues data are put in the application and when the stacks are put in during run-time.
A stack created by the user or a programmer is an implicit stack
A stack is a data structure in which last item inserted is taken out first . That's why they are known as LIFO (last in first out). Inserting an item in stack is termed as push and taking an item out from stack I s termed as pop. Stack pointer is the pointer that points to the top of the stack or that points the item at the top of the stack and help in adding or deleting the item from the top of stack.