Lex non scripta is an ancient Latin term that literally means "the unwritten law." This phrase is often used in legal contexts to refer to customs and practices that are not codified or written down in any official law or document. There are several synonyms for this term that can be used in different situations and contexts, including common law, customary law, traditional law, and unwritten law. Each of these terms refers to the same concept of laws and regulations that are passed down through cultural or social traditions, rather than being formalized through written legislation or government decrees.