The Nizari ( an-Nizāriyyūn) or Shī‘ah Imāmī Nizārī Ismā'īlī Ṭarīqah 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 Qu'ran and Hadith as resources), pluralism (the acceptance of racial, ethnic, cultural and intra-religious differences) and social justice.