Convergence is a term we commonly use in regards to how well weapons converge on the enemy target. For example, a very wide ship with weapons on each wing-tip may have very poor convergence because the hardpoints are very far apart from each other.
This becomes very important when using weapons that do not have any gimbal/turreted or automatic adjustment (micro-gimbal, such as small Gauss).
In AX combat, it is important that your weapons (Gauss in particular) have a very small convergence area. This will allow all of your weapons to be able to hit a small target (like a Thargoid Heart) simultaneously.
You can place weapons in hardpoints that are physically close together to improve convergence.
The outer hardpoints on the cutter have very poor convergence.
These hardpoints have a very tight convergence.