TEN = existence, perfection, wholeness, completion
- also known as deci- (from Latin) deca-/deka- (from Greek)
- associated with a decagon
- the word "ten" is derived from the Indo-European word dekm which means "two hands"
- ten is the first two-digit number in the decimal system, and the base of the decimal numeral system
- ten is the sum of the first four numbers (1+2+3+4), and the first three prime numbers (2+3+5)
- ten is the atomic number of neon
- Roman numeral is X, which looks like two stacked Vs (Roman numeral for 5)
- in astrology, the tenth sign of the Zodiac is Capricorn, the Goat (December 22 - January 20)
- in astrology, 10 is ruled by Saturn
- astrologers interpreted a decile (two planets at a 36 degree angle / one-tenth of a circle) as a foreteller of special gifts, exceptional mental ability, great technical insight, or success in one's career
- 10 ball in billiards is striped blue
- "on the 10th day of Christmas my true love gave to me, ten lords a-leaping, nine ladies dancing, eight maids a-milking, seven swans a-swimming, six geese a-laying, five golden rings, four calling birds, three french hens, two turtle doves and a partridge in a pear tree"
- tenth wedding anniversary gift is tin/aluminum
- The Ten Commandments of Exodus and Deuteronomy are considered a cornerstone of Judaism and Christianity
- Ten Plagues were inflicted on Egypt in Exodus
- the Bible records 10 generations between Adam and Noah, and 10 generations between Noah and Abraham
- there are ten cents in a U.S. or Canadian dime, itself and 10 dimes in a dollar
- Ludwig van Beethoven composed ten violin sonatas
- in blackjack and many card games, the Ten, Jack, Queen and King are all worth 10 points
- in ten-pin bowling, 10 pins are arranged in a triangular pattern, and there are 10 frames per game
- a collection of ten items (most commonly ten years) is called a decade
- something that scores perfectly is said to be "a perfect ten"
- "hang ten" is surfing slang for ten toes gripping a surfboard
- counting from one to ten before speaking is often done in order to cool one's temper
- there are ten official inkblots in the Rorschach inkblot test
- the traditional Snellen eyechart uses 10 different letters (C, D, E, F, L, N, O, P, T, Z)
- there are 10 provinces in Canada
- ten is the point value of letters Q and Z in Scrabble
