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* Dante Alighieri's Divine Comedy has 3 parts each of 33 cantos. It was written in terza rima, a combination of tercets. All of this is an allusion to the Christian Trinity.
* 3 is a number, numeral, and glyph
* 3 BC, the year 3 BC
* The 3 Musketeers is a novel by Alexandre Dumas, and is part of a trilogy.
* The 3 Sisters is a play by Anton Chekhov.
* 3 a rock band of Keith Emerson, Robert Berry and Carl Palmer
* 3 is a character from the television series The Prisoner
* 3 an experimental progressive band based in Woodstock, New York
* 3 an album released by rock band FireHouse
* III an album released by rock band Led Zeppelin
* Three (1969 film), a 1969 film starring Charlotte Rampling and Sam Waterston
* Three, a 1965 Yugoslavian film directed by Aleksandar Petrović
* Three is a book by Julie Hilden
* 3 a service of the New York City Subway
* 3 is the yellow line of Milano Subway
* 3 a group of UMTS-networks in Europe, Australia and Asia
* 3 Juno, a large asteroid
* 3 a personality type of the Enneagram of Personality
* Ȝ, a letter used in Middle English and Middle Scots
* 3 is the first odd prime number
* 3 is the second smallest prime.
* 3 is both the first Fermat prime (22º + 1) and the first Mersenne prime (2² - 1)
* 3 is the first lucky prime
*3 (三, 叁) is considered a good number in Chinese culture because it sounds like the word "alive" (生), compared to four (四) that sounds like the word "death" (死)
* 3 it's the second Sophie Germain prime
* 3 it's the second Mersenne prime exponent
* Plato split his utopian city into 3 populations: laborers, guardians (warriors), and philosophers (rulers)
* 3 it's the second factorial prime (2! + 1)
* After the fall of Constantinople, the Tsars considered Moscow as the Third Rome
* 3 is the first unique prime due to the properties of its reciprocal.
* 3 is the third Heegner number.
* Gurdjieff's 3 Centers and the Law of 3
* 3 is the second triangular number and it is the only prime triangular number
* The 3 Doshas (weaknesses) and their antidotes are the basis of Ayurvedic medicine in India
* 3 is the only prime which is one less than a perfect square. Any other number which is n² - 1 for some integer n is not prime, since it is (n - 1)(n + 1)
* 3 non-collinear points determine a plane and a circle.
* 3 is the fourth Fibonacci number and the third that is unique
* Feri Tradition teaches of the existence of 3 souls in each individual person
* In the Perrin sequence, however, 3 is both the zeroth and third Perrin numbers.
* DNA has a triplet codon system.
* 3 basic Earth divisions: Core- Mantle- Crust.
* Only 3 tetrahedral numbers are also perfect squares
* The 3 Kingdoms period (traditional Chinese: 三國) is a period in the history of China, part of an era of disunity called the Six Dynasties following immediately the loss of de facto power of the Han Dynasty emperors
* The 3 Stooges were an American vaudeville and comedy act of the early to mid-20th century best known for their numerous short subject films
* In Vietnam, it is bad luck to take a photo with 3 people in it.
* The 3 Gorges (simplified Chinese: 三峡) region is a scenic area along the Yangtze River in the People's Republic of China with a total length of approximately 200 km
* The 3 Principles of the People or collectively San-min Doctrine, is a political philosophy developed by Sun Yat-sen as part of a philosophy to make China a free, prosperous, and powerful nation
* 3 Mile Island is known for a nuclear accident
* In rugby union, 3 is the jersey number of the starting tighthead prop
* 3 is The Magic Number according to De La Soul
* 3 is the DVD region code for many East Asian countries


.......but also 3 are the islands in the pictures, from right to left Palmaria, Tino and Tinetto, in the Golfo dei Poeti in the eastern Liguria.

...today is mine 3th year on TE!