Numbers can be spooky, and when empowered with math and coincidence can be hypnotic and mind bogglingly influential and symbolic, or just weird and wonderful. Play on.
Cardinal eleven Ordinal 11th (eleventh) Factorization prime Prime 5th Divisors 1, 11 Greek numeral ΙΑ´ Roman numeral XI Greek prefix hendeca-/hendeka- Latin prefix undeca- Binary 10112 Ternary 1023 Quaternary 234 Quinary 215 Senary 156 Octal 138 Duodecimal B12 Hexadecimal B16 Vigesimal B20 Base 36 B36 Hebrew numeral יא
In other fields
Being only one hour before 12:00, the eleventh hour means the last possible moment to take care of something, and often implies a situation of urgent danger or emergency (see Doomsday clock).
American Airlines flight 11, a Boston–Los Angeles flight which crashed into the North Tower of the World Trade Center in New York City, New York after being hijacked by terrorists on September 11, 2001.
In the game of blackjack, an Ace can be counted as either one or 11, whichever is more advantageous for the player.
11 is the number of the French department Aude.
In the anime series Code Geass, Japan is known as Area 11 of the Brittanian Empire.
Evolution of the glyph
In the beginning, various Hindus wrote 7 more or less in one stroke as a curve that looks like an uppercase J vertically inverted. The western Ghubar Arabs’ main contribution was to make the longer line diagonal rather than straight, though they showed some tendencies to making the character more rectilinear. The eastern Arabs developed the character from a 6 lookalike into an uppercase V lookalike. Both modern Arab forms influenced the European form, a two-stroke character consisting of a horizontal upper line joined at its right to a line going down to the bottom left corner, a line that is slightly curved in some font variants. As is the case with the European glyph, the Cham and Khmer glyph for 7 also evolved to look like their glyph for 1, though in a different way, so they were also concerned with making their 7 more different. For the Khmer this often involved adding a horizontal line above the glyph. This is analogous to the horizontal stroke through the middle that is sometimes used in handwriting in the Western world but which is almost never used in computer fonts. This horizontal stroke is, however, important to distinguish the glyph for seven from the glyph for one in writings that use a long upstroke in the glyph for 1. In some Greek dialects of early 12th century the longer line diagonal was drawn in a rather semicircular transverse line.
On the seven-segment displays of pocket calculators and digital watches, 7 is the number with the most common glyph variation (1, 6 and 9 also have variant glyphs). Most calculators use three line segments, but on Sharp, Casio, and a few other brands of calculators, 7 is written with four line segments because, in Japan, Korea and Taiwan 7 is written as ① in the illustration to the right.
Most people in Continental Europe, and some in Britain and Ireland as well as Latin America, write 7 with a line in the middle (“
7“), sometimes with the top line crooked. The line through the middle is useful to clearly differentiate the character from the number one, as the two can appear similar when written in certain styles of handwriting. This glyph is used in official handwriting rules for primary school in Russia, Ukraine, Bulgaria, Poland, other Slavic countries,France, Italy, Belgium, Finland, Romania, Germany, Greece, and Hungary.[failed verification]
Why a simple number has such psychological and visceral appeal.
With thanks to Guy Winch – Posted Jun 27, 2015
Even people who are not “numbers people” may have a soft spot for one number in particular: 7. For various reasons, many of us find it fascinating, even magical.
Consider: Bestselling books feature it in their titles, (e.g., The Seven Habits of Highly Effective People), articles use it to intrigue readers (e.g., Seven Characteristics of Emotionally Strong People), and the mere sight of three sevens standing side-by-side can make us shriek with excitement—especially if we happen to be standing by a slot machine with a plastic bucket of quarters.
What is it about the number that causes such a visceral response? Why didn’t any slot-machine manufacturers make their jackpot sequence three ones in a row or even three fives? After all, one and five are perfectly good numbers. The fact is that, historically, the number 7 has played a significant role in society, culture, religion, and even psychology.
7 reasons we are so drawn to 7:
1. It has been significant since ancient times. It was prominent in many ancient cultures. Most famous of all were the seven wonders of the world which comprised a bucket list for every world traveler — the Great Pyramid of Giza, the Hanging Gardens of Babylon, the Temple of Artemis at Ephesus, the Statue of Zeus at Olympia, the Mausoleum at Halicarnassus, the Colossus of Rhodes, and the Lighthouse of Alexandria.
2. It has had significance in almost every major religion. In the Old Testament the world was created in six days and God rested on the seventh, creating the basis of the seven-day-week we use to this day. In the New Testament the number seven symbolizes the unity of the four corners of the Earth with the Holy Trinity. The number seven is also featured in the Book of Revelation (seven churches, seven angels, seven seals, seven trumpets, and seven stars). The Koran speaks of seven heavens and Muslim pilgrims walk around the Kaaba in Mecca (Islam’s most sacred site) seven times. In Hinduism there are seven higher worlds and seven underworlds, and in Buddhism the newborn Buddha rises and takes seven steps.
3. It is associated with luck and magical properties. Seven not only represents the jackpot on slot machines, but it s also the basis for many myths and folklore. For example, various parts of the world had beliefs about the seventh son of a seventh son, legends that endowed him with magical powers of both the good and evil variety (e.g., the child was believed to have healing powers according to Irish folklore).
4. It matches our memory capacity. In 1956, George Miller of Harvard University wrote what is today considered one of the classic papers in psychology in which he demonstrated that most people can retain roughly seven items of information in their short-term memory. That is why phone numbers in the U.S. and many other countries tend to have seven digits (area code not withstanding) — as it is the most digits most people are likely to recall (although cell phones have done away with the need to recall anyone’s phone number, even our own).
5. It fits our attention spans. Because of our mental capacity favoring seven items, seven is also a good fit for our attentions spans, as long as the information is presented in seven groups. While bloggers and authors tend to take advantage of this fact, some seem to take more advantage the others. For example, the book: 7 Pages to Success: The Ultimate Short-Attention-Span Guide to Unlock Your Full Potential! is only 7 pages long, which is fine, but it costs $7 (!), which leads me to believe the only real potential being unlocked is that of the author’s bank account.
6. It is a prime number. Prime numbers are those that can only be divided by themselves and by the number 1, and have long been considered special to mathematicians and non-mathematicians alike. Seven is considered by some to be the most ‘prime’ number within the first 10 numbers as you cannot multiply it within the group, making it a kind of optimal-prime (not to be confused with Optimus Prime, who is a Transformer).
7. It is the most popular number. The mathematician Alex Bellos asked 44,000 people to name their favorite number and over 4,000 of them named the number 7, far more than any other number. Indeed, ask people to name a number from one to ten and many will name the number seven — as many magicians know.
It is this combination of cultural, historical, religious, numerical, and psychological factors that contribute to the allure of the number 7 and the sway it has over our decisions. For example, my book, Emotional First Aid: Healing Rejection, Guilt, Rejection, and Other Everyday Hurts, was initially supposed to have eight chapters (one for each psychological ‘wound’) but after consulting with my editor, I decided to reduce the number of chapters (and wounds) to seven (loss, rumination, loneliness, and low self-esteem, in addition to the three in the subtitle) as I believed focusing on seven psychological wounds would be easier for readers to absorb and to recall rather than eight. Was I correct? Check out the book and let me know.