... alongside the tech name in the trading screen? It's not among the icons listed in the back of the manual.
It means it is a specialization tech.
Rhonin is right, any tech with that star is one of the multi choice techs, so trading for them if you haven't picked your own specialization yet can prevent you from getting multiple choices. if you mouse over it, it says which tech it leads to so you can look thru your own techs for something related that leads to the same tech
Thanks. This tech tree is going to take some getting used to.
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