The fragment of rock, ice, or metal that glows as it collides with the atmosphere is called a meteor.

Here's a breakdown:

* Meteoroid: A small body of rock, ice, or metal that orbits the Sun.

* Meteor: The streak of light created when a meteoroid enters the Earth's atmosphere and burns up due to friction. This is what we commonly call a "shooting star."

* Meteorite: A meteoroid that survives its passage through the atmosphere and hits the Earth's surface.

So, while the object itself is a meteoroid, the glowing phenomenon we see is the meteor.