you would call them BRASS KNUCKLES.
knucklephobia
a concave mirror
Arcs or curves.
I would suppose so, but due to both Knuckles' and Shadow's independent natures, it would be more fitting to call them "allies".
The blade at the end of a stick is called a "Bayonet".
blades haha jk you will trip over them if you tie it on the blade:)
Some people call it "sway back."
A blade on the end o a rifle is called a "Bayonet".
the corna
A polygon, but only if it has no curves.
A blade of grass?
Kris