Hi, check out this guide too:
http://forum.spaceo.net/index.php/topic,21.0.htmlCounter on SO Main:
- for each attack with remote fleets / ambush scout attack, defender gets a counter
- in full assault attacks defender get an attack signature if he loses 20% or more of his ships, or any segments, credits, workers
Counter = can only be used in remote attacks
Attack signature = can only be used in full assaults, it can pinpoint the exact location of the target in the Galaxy
- Both counter / attack signatures expire in 24 hours.
- for SO Wars only attack signature applies
We'll update the guide with this info, thank you.