Short answers, pulled from the story.
The Islamic world, also called the Muslim world or Ummah, refers to the global community of people who adhere to Islam. As of 2020, approximately 1.8 billion people, more than 25% of the world's population, are Muslim. Muslims are the majority in 49 countries and speak hundreds of languages from diverse ethnic backgrounds.
The Islamic Golden Age is traditionally held to have begun during the reign of the Abbasid caliph Harun al-Rashid (786-809) with the inauguration of the House of Wisdom in Baghdad. It produced major advances in science, medicine, philosophy, and technology, and ended with the Mongol invasions and the Siege of Baghdad in 1258. Key figures include Ibn Sina (Avicenna), whose Canon of Medicine was used in European universities for centuries, and Ibn al-Haytham, regarded as the father of optics.
Sunni and Shia Islam differ primarily on the question of who should have succeeded Muhammad as political and religious leader. Sunnis believe the successor should be chosen by consultation, as was done at the Saqifah when Abu Bakr was selected. Shia believe Muhammad designated his son-in-law Ali ibn Abi Talib as his true successor. Between 87 and 90% of the world's Muslims are Sunni, with Shia making up about 10-13%.
Saudi Arabia, Iran, Turkey, and Afghanistan were the only Muslim-majority regions not colonized by European powers. Turkey itself had been one of the earliest colonial powers in the world through the Ottoman Empire, which ruled several states for more than six centuries before its defeat and dissolution in 1908-1922.
One Thousand and One Nights is the best known work of fiction from the Islamic world. It reached its final form by the 14th century, drawing on Sanskrit and Persian folk tales including a pre-Islamic Persian prototype called Hezar Afsan. Its first European translation by Antoine Galland in the 18th century made it widely influential in the West, and characters like Aladdin, Sinbad the Sailor, and Ali Baba became cultural icons in Western culture.
The Hijra refers to Muhammad's migration in 622 CE from Mecca to Yathrib (now Medina), where he had been invited to establish a new constitution for the city under his leadership. The Hijra marks the first year of the Islamic calendar, making it the foundational event by which Muslims have measured time ever since.