9/11 plane crash locations

The number 9 is a natural number that follows 8 and precedes 10. It is the largest single-digit number in the decimal system. Mathematically, 9 is the fourth composite number and the first odd composite number. It is also notable for being the only square number that is the sum of two consecutive positive cubes: 32=9=13+233^2=9=1^3+2^332=9=13+23. Additionally, 9 is known for its use in the "casting out nines" method for checking arithmetic calculations. Culturally and symbolically, 9 is significant in various traditions. In Indian culture, it appears frequently in mythology and philosophy, including the nine universal substances in Hinduism and the Navaratri festival. In Chinese culture, the number 9 is associated with longevity and the dragon, which has nine forms and attributes. It also appears in numerous idioms such as "a cat has nine lives" and "to go the whole nine yards." In science, 9 is used in chemical nomenclature (e.g., nonane for a 9-carbon alkane) and is the normal human pregnancy duration in months. Psychologically, it is often used in pricing strategies. Moreover, "9" is the title of a 2009 animated post- apocalyptic science fiction film about a rag doll labeled "9" who awakens after humanity's demise, featuring voice actors like Elijah Wood and John C. Reilly. This summary covers the basic mathematical, cultural, scientific, and entertainment contexts of the number 9.