There are 7 wonders of the world, 7 metals of antiquity, 7 days of the week, and 7 colors of the rainbow.
7 seas, 7 continents, and 7 heavens.
There were 7 sages of China, 7 kings of Rome, 7 wise men of Greece, 7 rishis of India, and 7 wise masters of Sanskrit.
In the Bible, God rested on the 7th day. Jericho’s walls fell after 7 priests with 7 trumpets marched around the city 7 times. Jesus fed the masses with 7 loaves of bread. There are 7 gifts of the holy spirit, 7 deadly sins, and 7 virtues. In Revelation, there are 7 churches, 7 seals, 7 angels, 7 trumpets, 7 lampstands, 7 plagues, and 7 stars.
There are 7 holy sacraments in the Catholic church.
Buddha walked 7 steps at birth. There are 7 Chakras. Ghandi listed 7 blunders of the world. In the Islamic world, babies are named on their 7th day of life. The Khasi’s of India believe 7 divine women were the ancestresses of all humankind.
The Israelites displaced 7 nations. A Jewish wedding has 7 blessings. Shiva lasts 7 days. 7 shepherds visit the sukkah during the holiday of Sukkot. Passover is celebrated for 7 days in Israel.
In movies, there’s 007, Se7en, The Seven Year Itch, The Magnificent Seven, Seven Years in Tibet, and Seven Pounds.
7 books of Harry Potter. Harry was born in July, the 7th month. 7 years of school at Hogwarts. 7 secret passages out of Hogwarts. Harry wears #7 on his Quidditch robe. There are 7 players on a Quidditch team. Professor Moody’s cubby was secured with 7 locks. A chapter in book 7 is named The Seven Potters. Lord Voldemort’s soul was divided into 7 Horcruxes.
In Game of Thrones, there are 7 kingdoms of Westeros. Their religion is Faith of the Seven, and the holy text is The Seven Pointed Star. In the 7th season, 7 heroes go north of the wall.
Snow White and the 7 dwarfs.
7 is a prime number. It’s a Mersenne prime, a double Mersenne prime, the only Mersenne safe prime, a Newman-Shanks-Williams prime, and a Woodall prime.
Opposite sides of a 6-sided dice always add up to 7, and 7 is the most common combination of two dice.
There are 7 players on a cross country team, 7 on a handball team, 7 on an ultimate frisbee team, and 7 on a water polo team. A standard basketball is size 7. Baseball has the 7th inning stretch.
Micky Mantle, David Beckham, Phil Esposito, John Elway, Christiano Renaldo, and Big Ben. All wore #7. Beckham even named his daughter Seven.
7 is a neutral pH. 7 rows in the periodic table. 7 types of viruses. 7 types of crystals. 7 base units in physics .
Mammals have 7 neck vertebrae.
Tap your heels together 7 times and say the number 7 and you’ll find yourself at the base of Thomas Jefferson’s statue in the Rotunda, dropping off your handwritten note to the Seven Society.
As far as I know, they don’t have a public z-address.