Hi,
WElcome to the Forum from my side, too.
These things are usually identfied as "lance shoe" or "ferrule". That means the thing on the non-point end of a spear or lance preventing it from splintering and enabling it to be rammed into the ground.
Myself I am always a bit sceptical since these things could be on any long wood object or pole to be rammed into the earth. If in a garden one could think about beanstalks and the like.
Greets
Namxat