While the term "asteroid" can be used for any rocky object orbiting the Sun, they come in different sizes.

Here are some terms you might see used for different sizes:

* Asteroid: Generally refers to a rocky body larger than 1 meter in diameter.

* Meteoroid: A small rocky body, typically less than 1 meter in diameter.

* Micrometeoroid: Even smaller, often microscopic, particles of dust or rock.

When a meteoroid enters the Earth's atmosphere and burns up, it creates a meteor (shooting star). If a meteoroid survives the journey through the atmosphere and lands on Earth, it's called a meteorite.