In Germany, the 2G rule (2G-Regel) refers to public health rules during the COVID-19 pandemic for vaccinated (German: geimpft) or recovered (German: genesen) people.
More restrictive versions are the 2G+ (additionally requiring a rapid test) and the 2G++ rules (additionally requiring a rapid test and the wearing of an FFP2 Mask). 3G is less restrictive in that any testing would supersede, rather than complement, the other two requirements ("vaccinated or recovered").[1][2] All tests must have been administered at an official test site.