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An indoor location tracking map on a mobile phone. Mobile phone tracking is a process for identifying the location of a mobile phone, whether stationary or moving. . Localization may be affected by a number of technologies, such as the multilateration of radio signals between (several) cell towers of the network and the phone or by simply
A Mersenne prime is a prime number that is one less than a power of two, such as 3, 7, 31, 127, etc. Learn about their history, connection to perfect numbers, and unsolved problems in mathematics.
A national identification number is a system used by many countries to track their citizens, residents, and temporary residents for various purposes. Learn about the history, formats, and functions of national identification numbers in different regions, such as Africa, South Africa, and Zimbabwe.
A DEA number is an identifier assigned by the US Drug Enforcement Administration to health care providers who can prescribe controlled substances. Learn how to read and verify a DEA number, and what it means for different types of registrants.
ANPR is a technology that uses optical character recognition on images to read vehicle registration plates to create vehicle location data. It is used by police forces, toll collection, and traffic monitoring, but also raises privacy issues and concerns.
Learn how the US tracks and catalogs artificial objects in space, including satellites and debris. Find out how the Sputnik launch triggered the development of the Space Tracking System and the Space Surveillance Network.
Learn about the alphanumeric plates used to display the registration mark of a vehicle in the United Kingdom since 1904. Find out the current and previous series, sizes, colours, fonts, and specifications of number plates for Great Britain and Northern Ireland.
Mach number is a dimensionless quantity that compares flow velocity to speed of sound. Learn about subsonic, transonic, supersonic, hypersonic and hypervelocity flows, and how to calculate Mach number from speed and temperature.