EU
EU is the abbreviation used for the European Union.
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The Euro doesn't have an abbreviation (it is only 4 letters!), but it does have a symbol: '€'.
EBA is an abbreviation for the European Banking Authority, an organization created in 2011 to stress test European banks. It's also an abbreviation for European Business association, among other things.
There is no a full name of any European country. It might be a part of a name - say Man standing for the Isle of Man (between UK and Ireland). Most probably it's an abbreviation; Germany uses the abbreviation FRG.
European Association of Securities Dealers Automatic Quotation system.
"pt." is the abbreviation of Portuguese. If you wanna write specific about the Portuguese variant/accent from Brazil, you can write "pt_br."/"pt-br." You can go with "pt_pt."/"pt-pt." if talking about the Portuguese accent or European Portuguese.
Europe is the second smallest continent in size. It is usually abbreviated as either EUR or EU. However, EU will not be used as much as this is the abbreviation for the European Union.
Two meanings for EAS are Emergency Alert System and European Auto Source.
Fr. stands for Father. It was used by Christian mission presidents and European Catholic priests.
CERN is the abbreviation of European Council for Nuclear Research in French, ie. Conseil Européen pour la Recherche Nucléaire.