Meaning

• A toothed wheel that enmeshes with a chain or other perforated band.

• (usually in the plural) The tooth of such a wheel.

• A flared extension at the base of a sloped roof.

• 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."