The present article examines the elements that form or are deeply connected to the category of the Great Name in the cognitive system of Imami traditions. The main issue is how to explain the relationship of the Great Name with concepts such as the vision of the kingdom, knowledge of the book, the Quran, the revealing book, and the Holy Spirit within the framework of guardianship, and then how to approach the answer to the question of whether the Great Name is simply a word or does it have an existential and formative reality? The hypothesis of the research is that the Great Name forms the conceptual core of the system of the unseen and guardianship and is proposed as the source of the legislative and formative guardianship of the Prophet and the Imams (a). The aim of the article is to explain this conceptual system and their place in it. The research method is analytical-interpretive and based on a library study of Imami hadith sources. The results of the research show that the Greatest Name is a comprehensive and generative truth that the Holy Prophet (PBUH) and the pure Imams (AS) enjoy in all of it, with the exception of one letter (the possessive noun), and this enjoyment places them as the manifestation of the divine names and the mediator of divine grace in the world of creation and legislation.