Enforcement Rules of the Act Governing Relations with Hong Kong and Macau Article 3

The term “Hong Kong passport” as used Paragraph 1 of Article 4 of the Act refers to a travel document with passport function issued by the Hong Kong Government or other authorized organizations, for Hong Kong Residents’ use for international travel.
中文原文 香港澳門關係條例施行細則第3條
本條例第四條第一項所稱香港護照,係指由香港政府或其他有權機構核發,供香港居民國際旅行使用,具有護照功能之旅行證照。

English translation for reference only; the Chinese text prevails. Not legal advice.