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  2. Checker shadow illusion - Wikipedia

    en.wikipedia.org/wiki/Checker_shadow_illusion

    Description. The image depicts a checkerboard with light and dark squares, partly shadowed by another object. The optical illusion is that the area labeled A appears to be a darker color than the area labeled B. However, within the context of the two-dimensional image, they are of identical brightness, i.e., they would be printed with identical ...

  3. List of typographical symbols and punctuation marks - Wikipedia

    en.wikipedia.org/wiki/List_of_typographical...

    Typographical symbols and punctuation marks are marks and symbols used in typography with a variety of purposes such as to help with legibility and accessibility, or to identify special cases. This list gives those most commonly encountered with Latin script. For a far more comprehensive list of symbols and signs, see List of Unicode characters.

  4. Combinatorial proof - Wikipedia

    en.wikipedia.org/wiki/Combinatorial_proof

    A proof by double counting. A combinatorial identity is proven by counting the number of elements of some carefully chosen set in two different ways to obtain the different expressions in the identity. Since those expressions count the same objects, they must be equal to each other and thus the identity is established. A bijective proof.

  5. List of battery types - Wikipedia

    en.wikipedia.org/wiki/List_of_battery_types

    Lithium-ion polymer battery (LiPo) Lithium–iron–phosphate battery (LFP) Lithium–nickel–manganese–cobalt oxides (NMC) Lithium–nickel–cobalt–aluminium oxides (NCA) Lithium–sulfur battery. Lithium–titanate battery (LTO) Thin-film lithium-ion battery. Lithium–ceramic battery [2][3] Rechargeable lithium–metal battery.

  6. Fox (code word) - Wikipedia

    en.wikipedia.org/wiki/Fox_(code_word)

    Fox (code word) Fox is a brevity code used by NATO pilots to signal the simulated or actual release of an air-to-air munition or other combat function. Army aviation elements may use a different nomenclature, as the nature of helicopter -fired weapons is almost always air-to-surface. "Fox" is short for "foxtrot", the NATO phonetic designation ...

  7. Predicate (mathematical logic) - Wikipedia

    en.wikipedia.org/wiki/Predicate_(mathematical_logic)

    Predicates in different systems [ edit ] A predicate is a statement or mathematical assertion that contains variables, sometimes referred to as predicate variables, and may be true or false depending on those variables’ value or values.

  8. List of jazz genres - Wikipedia

    en.wikipedia.org/wiki/List_of_jazz_genres

    Artists mix different styles of music into jazz. 1970s -> Dixieland: Dixieland music or New Orleans jazz, sometimes referred to as hot jazz or early jazz, is a style of jazz music which developed in New Orleans at the start of the 20th century. Stylistically, it is essentially a form of Ragtime typically transposed for brass band, banjo or ...

  9. Secure Hash Algorithms - Wikipedia

    en.wikipedia.org/wiki/Secure_Hash_Algorithms

    The Secure Hash Algorithms are a family of cryptographic hash functions published by the National Institute of Standards and Technology (NIST) as a U.S. Federal Information Processing Standard (FIPS), including: SHA-0: A retronym applied to the original version of the 160-bit hash function published in 1993 under the name "SHA".