None. Most likely, you saw a plate with:
The country abbreviated as ROU is Romania.
Translation: "How is it abbreviated?"
Switzerland
Sweden is most commonly abbreviated as "SE". Other countries that begin with "Sw" are abbreviated as: Swaziland "SZ" Switzerland "CH"
The Internet domain .SE is Sweden.
GRN = Grenada
Switzerland
SoCal
There are no countries in Mexico, Mexico is a country.
Lashkar-E-Tayyaba
korea usually south
Syrian Arab Republic