What is the meaning of Pinwheel?

A cogged (toothed) gear.

A toy for children, comprising an artificial (usually plastic) stem and a flower that spins round in the wind like a tiny windmill.

A firework that spins in the shape of a spinning wheel.

A pastry made by laying out dough flat, smearing a topping over it and rolling it up into a spiral, then baking it, resulting in a swirl of filling.

Any food product consisting of layers (for example of pastry and sweet filling, or of bread and meat) rolled into a spiral.

To spin.

Source: wiktionary.org