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ICAO is the International Civil Aviation Organization. The organization's DOC 9303 requires a unique identification number for travel documents, which is often believed to be the reason why a CN citizen's passport number can change. The document has 13 parts, with the first four being relevant to this issue. The control number is a unique number assigned to the document for record and security purposes, while the identifier is a unique data string used as a person's identity and related attributes in biometric systems. The eMRP is an electronic machine-readable passport with an embedded non-contact integrated circuit that can identify the document holder's biometric features. The document recommends using the unique document number as the passport number, which should appear on all pages of the document and be printed or perforated. The passport number should also be a special type of font or number printed with ink that fluoresces under ultraviolet light. The document code for machine-readable passports is the letter P, which can be followed by another letter to indicate other types of passports. The passport number is a unique number given by the issuing country or organization to distinguish it from all other machine-readable travel documents issued by that country or organization. The personal number is a selective field used to register the personal identification number given by the issuing country or organization to the holder. The passport number change is related to ICAO DOC 9303 (8th edition, 2021).