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https://en.wikipedia.org/wiki/United_Nations_laissez-passer

A United Nations laissez-passer (UNLP or LP) is a travel document issued by the United Nations under the provisions of Article VII of the 1946 Convention on the Privileges and Immunities of the United Nations[1] in its offices in New York and Geneva, as well as by the International Labour Organization (ILO).[2] As of 30 April 2010 there were 35,577 UNLPs outstanding.[3] The UNLP is issued to UN and ILO staff as well as staff members of international organizations such as the WHO, the IAEA, the World Tourism Organization, the Comprehensive Nuclear-Test-Ban Treaty Organization Preparatory Commission, the Organization for the Prohibition of Chemical Weapons (OPCW), the World Trade Organization, the International Monetary Fund, the International Organization for Migration (IOM) and the World Bank. The document is written in English and French.

The UNLP is a valid travel document, which can be used like a national passport (in connection with travel on official missions only). However, UNLP holders often encounter immigration officials who are unfamiliar with the document and require them to show a national passport in addition.[4] As with national passports, some countries/regions accept it for entry without the need for a visa (e.g., Kenya, United Kingdom, Schengen Area, Lebanon, etc.), while other countries may require a visa before it can be accepted for entry to the country (depending on the nationality of the UNLP holder).

Most officials hold a blue UNLP (up to D-1 level), which is similar in legal status to a service passport (however, diplomatic status may be conferred on the holder if the visa issued in the UNLP is a diplomatic visa). A red UNLP is issued to particularly high officials (D-2 and above), and depending on their rank, this may confer diplomatic privileges and the red UNLP may therefore be similar to a diplomatic passport.