Central Europe
If one were to divide the continent of Europe into two halves like it was during the Cold War, the Iron Curtain would subsequently split the mainstream definition of "Central Europe" in half.  When using this definition, the countries of Czech Republic, Hungary, Poland, Slovakia and Slovenia would be included in Eastern Europe: whereas the countries of Austria, Germany, Liechtenstein and Switzerland would be considered Western Europe instead. Some experts consider this definition outdated, but many still use them. Supranational organizations like the UN and EU also make use of them.