Sprocket

Noun

1. A toothed wheel that enmeshes with a chain or other perforated band<!--not directly with other sprockets-->.
2. The tooth of such a wheel.
3. A flared extension at the base of a sloped roof.
4. A placeholder name for an unnamed, unspecified, or hypothetical manufactured good or product.

   "Suppose we have a widget factory that produces 100 widgets per year, and a sprocket factory that produces 200 sprockets per year."