Honor is simply the morality of superior men.
The ☮ Interplanetary Code of Honor is a rule that superseeds any Laws in which players cannot attack players whose score is lower than 40% their score or higher than 500% their score. This is a measure introduced since the beginning of SpaceHunt on Era 1 to avoid strong players abusing newcomers.
Departing a Raid that violates the ☮ Interplanetary Code of Honor is possible, but once it reaches its target the ☮️ Interplanetary Code of Honor will be triggered and the mission will be cancelled, units will return back to base empty-handed.