steelie

noun4

1. •
   [plural only] (informal) A steel-toe boot.

   • Better wear your steelies when he's around. [implying that he is clumsy]
2. •
   (informal) A steel wheel.

   • old Mopars wearing steelies with dog dishes
3. •
   A steel bearing ball used as a marble.

   • The steelies were just balls of steel, industrially ugly and not part of most girls' collections. There were four sizes of marbles and we called them boulders, biggies, regulars, and teenies. — 2006
4. •
   (US) A zinc-coated steel one-cent (penny) coin, produced during World War II because of copper shortages.