What does this 10% mean?

[RDomico]

What does this mean? Does it mean for all units for the rest of the game I get 10% production bonus? Is it just this age? Is it all cities or just my capital?

 

[Siptah]

Afaik it is empire-wide but only for the current age.

 

[Krikkit1]

UI needs massive improvement (been true since Civ I though)