The firefighters of New York City call them riding boards.

On the West Coast, some firefighters call it a "Habitrail house."

The other firefighters called him Curly, because of his buzz haircut.

At 9:24, a firefighter calls in from the 48th floor of the south tower.

The firefighters are calling in modern technology, including computers and helicopters that can siphon water out of nearby lakes to drop on the flames.

This is a tool that firefighters have been calling for years.

They had found a few precarious pockets of space, which the firefighters called voids.

One firefighter called the blaze a "three-headed monster": it's moving in three directions at once, and given the wind, its movement is unpredictable.

Some firefighters called it a misallocation of resources, others were simply frustrated at the delay.

Finally, 105 Truck "took up," as firefighters call it when they leave a scene.