section_path: Text and arrangement
section_name: Text and arrangement
paragraph_text: Text and arrangement
  
  The Quran consists of 114 chapters of varying lengths, known as a sūrah. Each sūrah consists of verses, known as āyāt, which originally means a 'sign' or 'evidence' sent by God. The number of verses differs from sūrah to sūrah. An individual verse may be just a few letters or several lines. The total number of verses in the most popular Hafs Quran is 6,236; however, the number varies if the bismillahs are counted separately. According to one estimate the Quran consists of 77,430 words, 18,994 unique words, 12,183 stems, 3,382 lemmas and 1,685 roots.
  
  Chapters are classified as Meccan or Medinan, depending on whether the verses were revealed before or after the migration of Muhammad to the city of Medina on traditional account. However, a sūrah classified as Medinan may contain Meccan verses in it and vice versa. Sūrah names are derived from a name or a character in the text, or from the first letters or words of the sūrah. Chapters are not arranged in chronological order, rather the chapters appear to be arranged roughly in order of decreasing size. Each sūrah except the ninth starts with the Bismillah (بِسْمِ ٱللَّٰهِ ٱلرَّحْمَٰنِ ٱلرَّحِيمِ), an Arabic phrase meaning 'In the name of God.' There are, however, still 114 occurrences of the Bismillah in the Quran, due to its presence in Quran 27:30 as the opening of Solomon 's letter to the Queen of Sheba.
  
  The Muqattaʿat (Arabic: حروف مقطعات ḥurūf muqaṭṭaʿāt, 'disjoined letters, disconnected letters'; also 'mysterious letters') are combinations of between one and five Arabic letters figuring at the beginning of 29 out of the 114 chapters of the Quran just after the basmala. The letters are also known as fawātih (فواتح), or 'openers', as they form the opening verse of their respective suras. Four suras are named for their muqatta'at: Ṭāʾ-Hāʾ, Yāʾ-Sīn, Ṣād, and Qāf. The original significance of the letters is unknown. Tafsir (exegesis) has interpreted them as abbreviations for either names or qualities of God or for the names or content of the respective suras. According to Rashad Khalifa, those letters are Quranic initials for a hypothetical mathematical code in the Quran, namely the Quran code but this has been criticized by Bilal Philips as a hoax based on falsified data, misinterpretations of the Quran's text.
  
  In addition of the division into chapters, there are various ways of dividing Quran into parts of approximately equal length for convenience in reading. The 30 juz' (plural ajzāʼ) can be used to read through the entire Quran in a month. A juz' is sometimes further divided into two ḥizb (plural aḥzāb), and each hizb subdivided into four rubʻ al-ahzab. The Quran is also divided into seven approximately equal parts, manzil (plural manāzil), for it to be recited in a week. A different structure is provided by semantic units resembling paragraphs and comprising roughly ten āyāt each. Such a section is called a ruku.