OEIC is just a legal form for investment funds, and used generally in UK. Also known as ICVC in UK:
There are other legal forms for investment funds in Europe, according to each country, such as, SICAV, SICAF, ICAV, FCP, etc. Also there are other legal forms outside Europe.
Using that kind of information would be too technical and a large list of potencial funds nomenclatures/legal forms, and most people don’t have financial literacy to understand each nomenclature and their differences.
So it’s better to understand and simple, to resume it, as it have all types/legal forms and domiciled-countries: