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2. Calculator spelling - Wikipedia

   en.wikipedia.org/wiki/Calculator_spelling

   Calculator spelling is an unintended characteristic of the seven-segment display traditionally used by calculators, in which, when read upside-down, the digits resemble letters of the Latin alphabet. Each digit may be mapped to one or more letters, creating a limited but functional subset of the alphabet, sometimes referred to as beghilos (or ...

3. Fibonacci sequence - Wikipedia

   en.wikipedia.org/wiki/Fibonacci_sequence

   In mathematics, the Fibonacci sequence is a sequence in which each number is the sum of the two preceding ones. Numbers that are part of the Fibonacci sequence are known as Fibonacci numbers, commonly denoted Fn. The sequence commonly starts from 0 and 1, although some authors start the sequence from 1 and 1 or sometimes (as did Fibonacci) from ...

4. Kelvin - Wikipedia

   en.wikipedia.org/wiki/Kelvin

   The 19th century British scientist Lord Kelvin first developed and proposed the scale. [ 5 ] It was often called the "absolute Celsius" scale in the early 20th century. [ 6 ] The kelvin was formally added to the International System of Units in 1954, defining 273.16 K to be the triple point of water. The Celsius, Fahrenheit, and Rankine scales ...

5. Windows Calculator - Wikipedia

   en.wikipedia.org/wiki/Windows_Calculator

   A simple arithmetic calculator was first included with Windows 1.0. [5]In Windows 3.0, a scientific mode was added, which included exponents and roots, logarithms, factorial-based functions, trigonometry (supports radian, degree and gradians angles), base conversions (2, 8, 10, 16), logic operations, statistical functions such as single variable statistics and linear regression.

6. Mechanical calculator - Wikipedia

   en.wikipedia.org/wiki/Mechanical_calculator

   The mechanical calculator industry started in 1851 Thomas de Colmar released his simplified Arithmomètre, which was the first machine that could be used daily in an office environment. For 40 years, [ 58 ] the arithmometer was the only mechanical calculator available for sale and was sold all over the world.

7. Sumlock ANITA calculator - Wikipedia

   en.wikipedia.org/wiki/Sumlock_ANITA_calculator

   Sumlock-Anita Electronics also assembled in Britain some of the Rockwell hand-held calculators, including Rockwell models 8R, 10R, 18R, 20R, 21R, 30R, 31R. The "Panaplex" is a gas-discharge display, using 7 segments to represent each number, within a thin glass "sandwich". The numerals glow amber. This list of calculator models may not be complete.

8. Fermi problem - Wikipedia

   en.wikipedia.org/wiki/Fermi_problem

   Fermi problem. This article is about the estimation technique. For Fermi's question about extraterrestrial life, see Fermi paradox. A Fermi problem (or Fermi quiz, Fermi question, Fermi estimate), also known as an order-of-magnitude problem (or order-of-magnitude estimate, order estimation), is an estimation problem in physics or engineering ...

9. TI-83 series - Wikipedia

   en.wikipedia.org/wiki/TI-83_series

   TI-83 series. The TI-83 series is a series of graphing calculators manufactured by Texas Instruments. The original TI-83 is itself an upgraded version of the TI-82. [1] Released in 1996, it was one of the most popular graphing calculators for students. In addition to the functions present on normal scientific calculators, the TI-83 includes ...