Does anyone know what a Logstag 'wall' is?

[LL12]

I have had someone do a garden design for me and she has included an area which she has written "Gravel area with logstag 'wall' edge to encourage wildlife.
Does anyone have one of these of can describe what it actually looks like? I have tried googling and can't find out what it is, we will be doing the garden work ourselves.

Maybe something like this?? this

Yes, I suspect it's a typo for log stack. It'll provide a home for beetles and other beneficial bugs.

Thank you both so much, that makes much more sense.