What is "nizari"

The Nizari ( an-Nizāriyyūn), known by its members as the Nizari tariqa, are the second-largest branch of Shia Islam (the largest being the Twelver). There are an estimated 15 million Nizari residing in more than 25 countries and territories. Nizari teachings emphasize human reasoning ( Ijtihad, the individual use of one's reason when using both the Quran and Hadith as resources), pluralism (the acceptance of racial, ethnic, cultural and intra-religious differences) and social justice.