Stack pointer

<architecture, programming> (SP) A register or variable pointing to the top of a stack.

If the stack is a "full" stack the SP points to the most recently pushed item, else if it is an "empty" stack, the PS points to the first empty location, where the next item will be pushed.

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Stack Environment Control Dump machine
stack frame
stacking order
stack loader
stack overflow
Advanced RISC Machine
AMD 29000
context switch
stack puke
stack traceback
Staggered Pin Grid Array