What type of credit card that is also a stamp on a passport allowing one to enter a country?

The type of credit card that also serves as a stamp on a passport is often referred to as a "visa." A visa is an official document issued by a country that allows a traveler to enter, stay, or leave that country for a specified period of time. While not a credit card in the traditional sense, the term "visa" can also refer to certain payment cards issued by financial institutions, but in the context of travel, it primarily pertains to the entry permission granted by a country.