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  1. Greek alphabet - Wikipedia › wiki › Greek_alphabet

    U+1F00–U+1FFF Greek Extended. The Greek alphabet has been used to write the Greek language since the late ninth or early eighth century BC. It is derived from the earlier Phoenician alphabet, and was the first alphabetic script in history to ...

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    • Greek
  2. SARS-CoV-2 Delta variant - Wikipedia › wiki › SARS-CoV-2_Delta_variant

    Classification The Delta variant has mutations in the gene encoding the SARS-CoV-2 spike protein [7] causing the substitutions D614G, T478K, P681R and L452R. [31] [9] It is identified as the 21A clade under the Nextstrain phylogenetic ...

  3. Delta (letter) - Wikipedia › wiki › Delta_(letter)
    • Pronunciation
    • Upper Case
    • Lower Case
    • Computer Encodings
    • See Also

    In Ancient Greek, delta represented a voiced dental plosive /d/. In Modern Greek, it represents a voiced dental fricative /ð/, like the "th" in "that" or "this" (while /d/ in foreign words is instead commonly transcribed as ντ). Delta is romanized as d or dh.

    The uppercase letter Δ is used to denote: 1. Change of any changeable quantity, in mathematics and the sciences (more specifically, the difference operator); for example, in:y 2 − y 1 x 2 − x 1 = Δ y Δ x , {\\displaystyle {\\frac {y_{2}-y_{1}}{x_{2}-x_{1}}}={\\frac {\\Delta y}{\\Delta x}},} the average change of y per unit x (i.e. the change of y over the change of x). Delta is the initial letter of the Greek word διαφορά diaphorá, "difference". (The small Latin letter d is used in much the same way for the notation of derivatives and differentials, which also describe change by infinitesimalamounts.) 2. The Laplace operator: 2.1. Δ f = ∑ i = 1 n ∂ 2 f ∂ x i 2 {\\displaystyle \\Delta f=\\sum _{i=1}^{n}{\\frac {\\partial ^{2}f}{\\partial x_{i}^{2}}}} 3. The discriminant of a polynomial equation, especially the quadratic equation: 3.1. Δ = b 2 − 4 a c {\\displaystyle \\Delta =b^{2}-4ac} 4. The area of a triangle 4.1. Δ = 1 2 a b sin ⁡ C {\\displaystyle \\Delta ={\\tfrac {1}{2}}ab\\sin {C}} 5. The symm...

    The lowercase letter δ (or 𝛿) can be used to denote: 1. A change in the value of a variable in calculus 2. A Functional derivative in Functional calculus 3. An auxiliary function in calculus, used to rigorously define the limit or continuityof a given function 4. The Kronecker deltain mathematics 5. The degree of a vertex (graph theory) 6. The Dirac delta functionin mathematics 7. The transition function in automata 8. Deflectionin engineering mechanics 9. The force of interestin actuarial science 10. The chemical shift of nuclear magnetic resonancein chemistry 11. The relative electronegativity of different atoms in a molecule, δ− being more electronegative than δ+ 12. Text requiring deletion in proofreading; the usage is said to date back to classical times 13. In some of the manuscripts written by Dr. John Dee, the character of delta is used to represent Dee 14. A subunit of the F1 sector of the F-ATPase 15. The declination of an object in the equatorial coordinate system of ast...

    Greek Delta / Coptic Dalda
    Latin Delta
    Technical and Mathematical symbols
    Mathematical Delta
  4. Epsilon - Wikipedia › wiki › Epsilon
    • History
    • Uses
    • Unicode
    • Initial


    The letter Ε was taken over from the Phoenician letter He () when Greeks first adopted alphabetic writing. In archaic Greek writing, its shape is often still identical to that of the Phoenician letter. Like other Greek letters, it could face either leftward or rightward (), depending on the current writing direction, but, just as in Phoenician, the horizontal bars always faced in the direction of writing. Archaic writing often preserves the Phoenician form with a vertical stem extending sligh...

    Sound value

    While the original pronunciation of the Phoenician letter He was [h], the earliest Greek sound value of Ε was determined by the vowel occurring in the Phoenician letter name, which made it a natural choice for being reinterpreted from a consonant symbol to a vowel symbol denoting an [e] sound. Besides its classical Greek sound value, the short /e/ phoneme, it could initially also be used for other [e]-like sounds. For instance, in early Attic before c. 500 BC, it was used also both for the lo...

    Epichoric alphabets

    Some dialects used yet other ways of distinguishing between various e-like sounds. In Corinth, the normal function of Ε to denote /e/ and /ɛː/ was taken by a glyph resembling a pointed B (), while Ε was used only for long close /eː/. The letter Beta, in turn, took the deviant shape . In Sicyon, a variant glyph resembling an X () was used in the same function as Corinthian . In Thespiai (Boeotia), a special letter form consisting of a vertical stem with a single rightward-pointing horizontal b...

    International Phonetic Alphabet

    Despite its pronunciation as mid, in the International Phonetic Alphabet, the Latin epsilon /ɛ/ represents open-mid front unrounded vowel, as in the English word pet /pɛt/.


    The uppercase Epsilon is not commonly used outside of the Greek language because of its similarity to the Latin letter E. However, it is commonly used in structural mechanics with Young's Modulus equations for calculating tensile, compressive and areal strain. The Greek lowercase epsilon ε, the lunate epsilon symbol ϵ, or the Latin lowercase epsilon ɛ(see above) is used in a variety of places: 1. In engineering mechanics, strain calculations ϵ = increase of length / original length. Usually t...

    Greek Epsilon
    Coptic Eie
    Latin Open E
    Mathematical Epsilon
    Initial epsilon in Lectionary 226, folio 20 verso
    folio 64 verso
    folio 125 verso
  5. Lambda - Wikipedia › wiki › Lambda
    • Symbol
    • Character Encodings
    • See Also

    Upper-case letter Λ

    Examples of the symbolic use of uppercase lambda include: 1. The lambda particle is a type of subatomic particle in subatomic particle physics. 2. Lambda is the set of logical axioms in the axiomatic method of logical deduction in first-order logic. 3. Lambda was used as a shield pattern by the Spartan army during the Peloponnesian War. This stood for Lacedaemon (Λακεδαίμων, Lakedaímōn), the name of the polisof the Spartans, as opposed to the city itself. 4. Lambda is the von Mangoldt functio...

    Lower-case letter λ

    Examples of the symbolic use of lowercase lambda include: 1. Lambda indicates the wavelength of any wave, especially in physics, electronics engineering, and mathematics. 2. In evolutionary algorithms, λ indicates the number of offspring that would be generated from μ current population in each generation. The terms μ and λ are originated from Evolution strategynotation. 3. Lambda indicates the radioactivity decay constant in nuclear physics and radioactivity. This constant is very simply rel...

    Litra symbol

    The Roman libra and Byzantine lítra (λίτρα), which served as both the pound mass unit and liter volume unit, were abbreviated in Greek using lambda with modified forms of the iota subscript (as λͅ). These are variously encoded in Unicode. The Ancient Greek Numbers Unicode block includes 10183 GREEK LITRA SIGN (𐆃) as well as 𐅢, which is described as 10162 GREEK ACROPHONIC HERMIONIAN TEN but was much more common as a form of the litra sign. A variant of the sign can be formed from 0338 COMBIN...

    Unicode uses the spelling "lamda" in character names, instead of "lambda", due to "preferences expressed by the Greek National Body". 1. Greek Lambda / Coptic Laula 1. Mathematical Lambda These characters are used only as mathematical symbols. Stylized Greek text should be encoded using the normal Greek letters, with markup and formatting to indicate text style.

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  7. Moderna COVID-19 vaccine - Wikipedia › wiki › Moderna_COVID-19_vaccine

    The Moderna COVID‑19 vaccine (pINN: elasomeran [22]), codenamed mRNA-1273 and sold under the brand name Spikevax, [2] is a COVID-19 vaccine developed by Moderna, the United States National Institute of Allergy and Infectious Diseases (NIAID) and ...

  8. COVID-19 - Wikipedia › wiki › Covid-19

    Coronavirus disease 2019 (COVID-19) is a contagious disease caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). The first known case was identified in Wuhan, China, in December 2019. The disease has since spread worldwide, ...

  9. Nigeria - Wikipedia › wiki › Nigeria

    Nigeria's Delta region, home of the large oil industry, experiences serious oil spills and other environmental problems, which has caused conflict in the Delta region. Waste management including sewage treatment , the linked processes of ...