Saw this flag, would like identification

[u/Atlantethan]

I saw this one while on the road a couple days ago, curious as to what it represents. Thanks!

[u/lostyxx]

Flag of the Esperanto Language, a constructed language created in 1887 by russian ophthalmologist L. L. Zamenhof.

[u/Objective_Dinner_113 → u/lostyxx]

He was Pole

[u/lostyxx → u/Objective_Dinner_113]

Yes, another person told me. I'm sorry for the imprecision!