https://en.wikipedia.org/wiki/Flag_of_Europe
https://en.wikipedia.org/wiki/Flag_of_Kazakhstan
https://en.wikipedia.org/wiki/Flag_of_Ukraine
https://en.wikipedia.org/wiki/Flag_of_Sweden
https://en.wikipedia.org/wiki/Flag_of_Uruguay
https://en.wikipedia.org/wiki/Flag_of_Barbados
https://en.wikipedia.org/wiki/Flag_of_Palau
https://en.wikipedia.org/wiki/Flag_of_Alaska
https://en.wikipedia.org/wiki/Flag_of_South_Dakota
https://commons.wikimedia.org/wiki/Category:Flags_with_tridents
Lastly,
https://en.wikipedia.org/wiki/Flag_of_Kansas
Which features the phrase "AD ASTRA PER ASPERA"
A Latin phrase meaning "through hardships to the stars" or "Our aspirations take us to the stars".