Sunni Islam () is the largest branch of Islam, followed by 85–90% of the world's Muslims. Its name comes from the word Sunnah, referring to the tradition of Muhammad. The differences between Sunni and Shia Muslims arose from a disagreement over the succession to Muhammad and subsequently acquired broader political significance, as well as theological and juridical dimensions. According to Sunni traditions, Muhammad left no successor and the participants of the Saqifah event appointed Abu Bakr as the next-in-line (the first caliph). This contrasts with the Shia view, which holds that Muhammad appointed his son-in-law and cousin Ali ibn Abi Talib as his successor. The adherents of Sunni Islam are referred to in Arabic as ("the people of the Sunnah and the community") or for short. In English, its doctrines and practices are sometimes called Sunnism, while adherents are known as Sunni Muslims, Sunnis, Sunnites and Ahlus Sunnah. Sunni Islam is sometimes referred to as "orthodox Islam", though some scholars view this translation as inappropriate. The Quran, together with hadith (especially those collected in Kutub al-Sittah) and binding juristic consensus, form the basis of all traditional jurisprudence within Sunni Islam. Sharia rulings are derived from these basic sources, in conjunction with analogical reasoning, consideration of public welfare and juristic discretion, using the principles of jurisprudence developed by the traditional legal schools. In matters of creed, the Sunni tradition upholds the six pillars of imān (faith) and comprises the Ash'ari and Maturidi schools of Kalam (theology) as well as the textualist school known as traditionalist theology. Terminology Sunna The Arabic term Sunna, according to which Sunnis are named, is old and roots in pre-Islamic language. It was used for traditions which a majority of people followed. The term got greater political significance after the murder of the third Sunni Caliph ʿUthmān ibn ʿAffān. It is said Mālik al-Aschtar, a famous follower of ʿAlī ibn Abī Tālib, encouraged during the battle of Siffin with the expression, Ali's enemy Muʿāwiya ibn Abī Sufyān kills the Sunna. After the battle, it was agreed that "the righteous Sunnah, the unifying, not the divisive" ("as-sunna al-ʿādila al-ǧāmiʿa ġair al-mufarriqa") should be consulted to resolve the conflict. The time when the term sunna became the short form for "sunnah of the prophet" (sunnat an-nabī) is still unknown. During the Umayyad Caliphate, several political movements, amongst them the Shia and the Kharijites who rebelled against the formation of