Hunter spin
I seem to recall, on the / a Hunter, a white mark on the panel one pushed the stick towards and to one side for spin training.
Snag is, not having done it myself, I can't remember if it was for recovery or to promote a spin, which may be the sort of detail one rather cares about at the time.
It was quite possibly the ETPS Hunter, and sounds a bit like it would promote a spin in the right conditions.
If a type should have recovery characteristics requiring something like ' push it this way' ( most of the time, I know ) rather than ' leave it alone ' it would seem worth marking in such a manner for disorientated inexperienced pilots who may well have trouble remembering details from the notes if flustered ?...
DZ