How do I make a custom nation prefix?

[Spredronia]

It sounds noobish, but there's a lot of nations with custom nation types.

If someone could please give me the way to make a custom nation type I'd be grateful.

[Unibot]

The option to customize the prefix is available when your population reaches 500 million (about 3 months after playing).

Hope that helps!
Unibot

[Spredronia]

The option to customize the prefix is available when your population reaches 500 million (about 3 months after playing).

Hope that helps!
Unibot

Oh, 500 million. I just have to keep playing. Thanks Unibot!