For example the stack was often referred to as "Kellerstapelspeicher"[1]. The stack pointer was "Kellerstapelspeicherzeiger".
The whole stack terminology revolved around the basement (Keller = cellar) metaphor. For example push was "einkellern" and pop "auskellern". I think this was influenced by Friedrich L. Bauer's work.
[1] The linked manual is quite lax and uses just "Stapelspeicher" and "Stapelzeiger". But at least it has "Stapelzeigeradresse" which is a nice and long compound.