EE.UU. or EUA

[Glen]

Which is the more commonly-used abbreviation nowadays? I'm liking EUA more and more since it's shorter.

[Rusty]

The first set is an abreviatura, and is spelled EE. UU. (with periods and a space). You'll see EE.UU. and EEUU, but these are unofficial spellings.

The second set is a sigla. The initials are never separated with periods or spaces.

The abbreviation EE. UU. is used more than EUA.

[Don José]

In Spanish, EUA looks so similar to EAU (Emiratos Árabes Unidos). Since it may be a bit confusing I'd vote for EE. UU. And also because I'm used to it. :)

[aleCcowaN]

In Spanish, EUA looks so similar to EAU (Emiratos Árabes Unidos).
I concur. That's what I thought when I read it.

[Glen]

Thanks for pointing out the similarity to EAU, which I didn't realize. I'll keep using EE. UU., to avoid confusion. And thanks for mentioning the separation between "." and "U" as well, another thing I never knew.

[Thomas]

In Costa Rica it's very common to hear "los Estados". It may sound "Spanglish", but it's very accepted.