There are many components in the game. Each component or block belongs to a category.
Categories
Blocks
The core building blocks, beams, slopes and corners.
Water
Components specific to ships and submarines.
Air
Components specific to planes, hot air balloons and space ships.
Control
All of the components required to control your vehicles, spin blocks and sky fortresses as well as other components such as chairs and fire control computers.
Resource
Resource gathering, processing and storage components.
Engines
Engine components as well as electric engines and generators.
Misc
Various things that allow for repairing, spawning and re-spawning amongst other things.
Simple Weapons
A variety of one-component weapons.
Missiles
Everything you need to make missiles, torpedoes, mines and depths charges.
Decorations
Doors, stairs, lights, etc.
CRAM Cannons
Ballistic projectile weapons.
Advanced Cannons
Laser
Laser and anti-missile projection systems.
AI
AI components used to make autonomous vessels
Collections
Subobject
Subobjects are attached to spin blocks or turrets. Entire subobjects may be saved, and then later loaded in a single step.
Prefabs
Allows loading and saving of large chunks of a vehicle.