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  2. Number - Wikipedia

    en.wikipedia.org/wiki/Number

    A number is a mathematical object used to count, ... The earliest known use of irrational numbers was in the Indian Sulba Sutras composed between 800 and 500 BC.

  3. Renewable energy - Wikipedia

    en.wikipedia.org/wiki/Renewable_energy

    Renewable energy resources exist all over the world. This is in contrast to fossil fuels resources which are concentrated in a limited number of countries. There are also other renewable energy technologies that are still under development, for example enhanced geothermal systems, concentrated solar power, cellulosic ethanol, and marine energy.

  4. Erdős number - Wikipedia

    en.wikipedia.org/wiki/Erdős_number

    The Erdős number ( Hungarian: [ˈɛrdøːʃ]) describes the "collaborative distance" between mathematician Paul Erdős and another person, as measured by authorship of mathematical papers. The same principle has been applied in other fields where a particular individual has collaborated with a large and broad number of peers.

  5. Image resolution - Wikipedia

    en.wikipedia.org/wiki/Image_resolution

    Image resolution is the level of detail of an image. The term applies to digital images, film images, and other types of images. "Higher resolution" means more image detail. Image resolution can be measured in various ways. Resolution quantifies how close lines can be to each other and still be visibly resolved.

  6. Baud - Wikipedia

    en.wikipedia.org/wiki/Baud

    Baud. In telecommunication and electronics, baud ( / bɔːd /; symbol: Bd) is a common unit of measurement of symbol rate, which is one of the components that determine the speed of communication over a data channel . It is the unit for symbol rate or modulation rate in symbols per second or pulses per second. It is the number of distinct ...

  7. Wavenumber - Wikipedia

    en.wikipedia.org/wiki/Wavenumber

    In multidimensional systems, the wavenumber is the magnitude of the wave vector. The space of wave vectors is called reciprocal space. Wave numbers and wave vectors play an essential role in optics and the physics of wave scattering, such as X-ray diffraction, neutron diffraction, electron diffraction, and elementary particle physics.

  8. ACN-PCN method - Wikipedia

    en.wikipedia.org/wiki/ACN-PCN_method

    ACN-PCN method. The Aircraft Classification Number (ACN) – Pavement Classification Number (PCN) method is a standardized international airport pavement rating system promulgated by the ICAO in 1981. The method has been the official ICAO pavement rating system for pavements intended for aircraft of apron (ramp) mass greater than 5700 kg from ...

  9. Zero trust security model - Wikipedia

    en.wikipedia.org/wiki/Zero_trust_security_model

    The zero trust security model, also known as zero trust architecture ( ZTA ), and sometimes known as perimeterless security, describes an approach to the strategy, design and implementation of IT systems. The main concept behind the zero trust security model is "never trust, always verify", which means that users and devices should not be ...