“Spanner”? That’s not an American term. I don’t know an American that would call a wrench a “spanner”.
You’ve never heard of a spanner wrench?
You need to know more fire fighters.
https://www.mcmaster.com/products/spanner-wrenches/for-use-with~fire-hydrants/
Depends. Pin and hook spanners are commonly referred to as such, as least where I’ve worked. I’d say it’s reserved for specialty tools designed for a singular purpose, like a hydrant.
Just most of the Fire Departments in the USA call a spanner a spanner, however it might be shaped several ways.