Immigration stamps in passports

For immigration control, immigration officials of many countries stamp passports with entry stamps and exit stamps. A stamp can serve different purposes. In the United Kingdom, an immigration stamp in a passport includes the formal leave to enter granted to a person subject to entry control. Otherwise, a stamp activates or acknowledges the continuing leave [...]

European Union

Citizens of the member countries of the European Union are also citizen of the union itself, and this is recognised on the passports. They bear both the name of the European Union and of the issuing country (in the relevant language).
Citizens of the European Economic Area (the European Union plus Iceland, Liechtenstein and Norway) enjoy [...]

International Civil Aviation Organization Standards

Passport standards are recommended to national governments by the International Civil Aviation Organization (ICAO).
Passports have numerical or alphanumerical designators (“serial number“) assigned by the issuing authority.
The standard format includes, on a passport cover, the name of the issuing country, a national symbol, a description of the document (passport, official passport, diplomatic passport), and, if the [...]