Hardpoint

From EVE Wiki

Each ship has a specific number of hardpoints which are places to attach turret modules, launcher modules, and rigs.

[edit] Weapon hardpoints

Weapon hardpoints will limit the amount of a type of weaponry a ship can use. For example, the Caldari Raven battleship has a total of eight high slots. The ship's bonuses are aimed at missiles so you would normally want to fill all eight slots with missile launchers in order to maximize the damage output. However, the Raven only has six launcher hardpoints which means a maximum of six missile launchers. The other two slots can only be filled with non-launcher modules.

[edit] Rig hardpoints

Rig hardpoints allow for the installation of rigs (ship modifications). Rigs are permanently installed on the ship and cannot be removed. If you want to install a new rig in the place of an old one, you must destroy the installed rig first.

All ships, with the exception of Tech II ships, have 3 rig hardpoints.