If you meant something else (e.g., a feature of a specific software, book, or legal database named "MJMwt alqanwn aljnayy"), please provide more context so I can give a precise answer.
The phrase appears to be a transliteration of the Arabic "مجموعة القانون الجنائي" , which means "Penal Code" or "Criminal Code Collection."
If you are asking for a of a penal code (or a collection of criminal laws), a notable one is:
A strong penal code clearly defines what acts are criminal and what the punishments are before those acts are committed. This prevents arbitrary enforcement by authorities and ensures that citizens can know in advance what is prohibited.
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