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  1. en.wikipedia.org › wiki › UTF-8UTF-8 - Wikipedia

    3 天前 · UTF-8 is the dominant encoding for the World Wide Web (and internet technologies), accounting for 98.2% of all web pages, 99.1% of the top 100,000 pages, and up to 100% for many languages, as of 2024. [9] Virtually all countries and languages have 95% or more use of UTF-8 encodings on the web.

  2. 2 天前 · The Planck constant, or Planck's constant, denoted by , [1] is a fundamental physical constant [1] of foundational importance in quantum mechanics: a photon 's energy is equal to its frequency multiplied by the Planck constant, and the wavelength of a matter wave equals the Planck constant divided by the associated particle momentum.

  3. en.wikipedia.org › wiki › Unit_731Unit 731 - Wikipedia

    4 天前 · It was based in the Pingfang district of Harbin, the largest city in the Japanese puppet state of Manchukuo (now Northeast China) and had active branch offices throughout China and Southeast Asia . Established in 1936, Unit 731 was responsible for some of the most notorious war crimes committed by the Japanese armed forces.

  4. en.wikipedia.org › wiki › ISO_3166-1ISO 3166-1 - Wikipedia

    5 天前 · It defines three sets of country codes: [1] ISO 3166-1 alpha-2 – two-letter country codes which are the most widely used of the three, [citation needed] and used most prominently for the Internet's country code top-level domains (with a few exceptions).

  5. en.wikipedia.org › wiki › PiPi - Wikipedia

    2 天前 · The number π (/paɪ/; spelled out as "pi") is a mathematical constant that is the ratio of a circle's circumference to its diameter, approximately equal to 3.14159. The number π appears in many formulae across mathematics and physics. It is an irrational number, meaning that it cannot be expressed exactly as a ratio of two integers, although ...

  6. 4 天前 · This is a list of articles about prime numbers. A prime number (or prime) is a natural number greater than 1 that has no positive divisors other than 1 and itself. By Euclid's theorem, there are an infinite number of prime numbers. Subsets of the prime numbers may be generated with various formulas for primes.

  7. en.wikipedia.org › wiki › BitcoinBitcoin - Wikipedia

    2 天前 · Bitcoin (abbreviation: BTC; sign: ₿) is the first decentralized cryptocurrency. Nodes in the peer-to-peer bitcoin network verify transactions through cryptography and record them in a public distributed ledger, called a blockchain, without central oversight.