These are common terminology in Forth and other computer languages with a stack.

peek or tos

Examine top of stack. (... x y tos gives you y and keeps the stack)

push

Add element to top of stack; other elements are pushed down. (... x push y makes the stack ... x y)

pop

Remove element from top of stack. ( ... x y pop makes the stack ... x)

swap

Swap top two stack elements. (... x y swap makes the stack ... y x)

rot

"Rotate" top 3 elements, bringing third element to top of stack. (... x y z rot makes the stack ... y z x)

unrot

"Rotate" top 3 elements in other direction. (... x y z unrot makes the stack ... z x y)

dup

Duplicate top stack element. (... x dup makes the stack ... x x)

over

Duplicate second stack element over top of stack. (... x y over makes the stack ... x y x; equivalent to swap dup unrot)

nip, tuck, pick, ...

Over the years, Forth programmers invented many more useful operations!