A page of the Numeropedia - the Special Encyclopedia of Numbers
The number of letters, after the dot (.), in the standard Internet code of each country in the world. The codes are maintained by the International Organization for Standardization in the ISO-3166 Standard Country Codes, Alpha-2 List and used by the Internet Assigned Numbers Authority (IANA) to establish country-coded top-level domains (ccTLDs). Examples: .tr for Turkey, .my for Malaysia, .dk for Denmark, .ar for Argentina…
The first (number system) digit in the 12-digit UPC Version A (Universal Product Code for North America) barcode is 2 for weighted items, (followed by 5-digit manufacturing code, 5-digit product code and 1 check digit at the right end).
Rule of thumb: Twice as much power or intensity of sound is measured by 3 decibels (or exactly 10´log2) decibels higher.
The maximum SAR (Specific Absorption Rate) required by FCC for cellular phones is 1.6W/kg (watts per kilogram). In Europe it is 2W/kg.
The tail number of the current Air Force Two (Boeing 757-200, C-32A).
The “number system” code of an EAN-13 barcode for the U.S. and Canada’s products: 00, 01, 02, 03, 04, 05, 06, 07, 08, 09, 10, 11, 12 and 13.
The number of wheels of a bicycle or motorcycle.
The duration (minutes) of the world’s shortest non-stop commercial flight, by Loganair between Westray and Papa Westray in Scotland’s Orkney Islands. No meal service!
The 1-pilot U-2 spy plane, entered the service in 1955, has maximum altitude of 70,000 feet, cruising peed of 475 mph, flight range of 3452 miles and wing span of 104.8 feet.
An average person’s eyes are 2¾ inches or approximately 70 mm (millimeters) apart. This is also the width between the side-by-side left-eye and right-eye cameras used to record 3-D movie pictures.