[ggambetta]

FYI "EEUU" only makes sense in Spanish-speaking countries (AFAIK). When writing in English, for English-speaking audiences, use "the US". Otherwise everyone will be very confused, especially in the context of an article about the EU.

[nicofo]

Gracias por tu correccion ;)

[cblconfederate]

now i m curious why it is written like that

[ggambetta]

"United States" translates literally to "Estados Unidos" in Spanish. Because some rule that sounds unfathomably stupid to me, in Spanish you can turn that into EEUU instead of EU, because both the "E"s and the "U"s are plural ¯\_(ツ)_/¯

There's a few other examples I'm aware of, like FFAA for "Fuerzas Armadas" ("Armed Forces"), but I have the feeling this is an obsolete practice.

[cblconfederate]

Looks intuitive to me

[pessimizer]

According to some guy on Quora, it's a way to pluralize initialisms.