Official rule text
67.2 If the cost is accompanied by two icons—typically for fighters production values in that system. and infantry—a player produces two of that unit for that cost. b When producing fighters or infantry, each individual unit a Each of the two units counts toward the total number of counts toward the producing unit’s production limit. units a player can produce. c A player can choose to produce one fighter or infantry instead of two, but must still pay the entire cost. d “Production” value from Arborec space docks cannot be
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Source: Twilight Imperium: Fourth Edition - Living Rules Reference: Prophecy of Kings
Expansion: Prophecy of Kings
Version: 2.0
Reference: Rule 67.2