22 March: 81

On the 81st day of the year, 10 things you might not know about the number 81:

1. It's the square of 9 and the fourth power of 3.
2. 81 is used as a symbol for the Hell's Angels Motorcycle Club, because 'H' and 'A' are the 8th and 1st letters of the alphabet.
3. In Roman numerals it is written as LXXXI, and in Binary as 1010001.
4. +81 is the code for international direct dial phone calls to Japan.
5. Staying in Japan, 81 is the number of squares on a shogi playing board. Shogi is a two player board game sometimes referred to as Japanese Chess. The name means general's board game.
6. 81 is the atomic number of thallium, a chemical element with the symbol Tl. It is a grey metal not found in nature in its pure form. When isolated, thallium resembles Tin, but discolours when exposed to air. Chemists William Crookes and Claude-Auguste Lamy both discovered thallium independently in 1861, in residues of sulphuric acid production. Crookes gave the element its name, which comes from the Greek thallós, meaning "green shoot" or "twig".
7. There are 81 prayers in the Catholic Rosary.
8. There are 81 stanzas or chapters in the Chinese classic text, the Tao Te Ching.
9. In the USA, Interstate 81 is a road running from Dandridge, Tennessee to Wellesley Island at the Canadian border. It traces the paths created along the Appalachian Mountains through the Great Appalachian Valley by migrating animals, Native Americans and early settlers. It also follows a major corridor for troop movements during the Civil War.
10. In numerology the energy of number 81 is connected to humanitarianism and business. A person with this number in their numerology profile will have a vision for an ideal world which involves a healthy environment for business. They will want to help humanity, and will do so using a business perspective.

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