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  2. Greek letters used in mathematics, science, and engineering

    en.wikipedia.org/wiki/Greek_letters_used_in...

    The OpenType font format has the feature tag "mgrk" ("Mathematical Greek") to identify a glyph as representing a Greek letter to be used in mathematical (as opposed to Greek language) contexts. The table below shows a comparison of Greek letters rendered in TeX and HTML. The font used in the TeX rendering is an italic style.

  3. List of mathematical constants - Wikipedia

    en.wikipedia.org/wiki/List_of_mathematical_constants

    A mathematical constant is a key number whose value is fixed by an unambiguous definition, often referred to by a symbol (e.g., an alphabet letter), or by mathematicians' names to facilitate using it across multiple mathematical problems. [1]

  4. Phi - Wikipedia

    en.wikipedia.org/wiki/Phi

    Phi (/ f aɪ /; [1] uppercase Φ, lowercase φ or ϕ; Ancient Greek: ϕεῖ pheî; Modern Greek: φι fi) is the twenty-first letter of the Greek alphabet. In Archaic and Classical Greek (c. 9th to 4th century BC), it represented an aspirated voiceless bilabial plosive ( [pʰ] ), which was the origin of its usual romanization as ph .

  5. Golden ratio - Wikipedia

    en.wikipedia.org/wiki/Golden_ratio

    By 1910, inventor Mark Barr began using the Greek letter phi (⁠ ⁠) as a symbol for the golden ratio. [32] [e] It has also been represented by tau (⁠ ⁠), the first letter of the ancient Greek τομή ('cut' or 'section'). [35] Dan Shechtman demonstrates quasicrystals at the NIST in 1985 using a Zometoy model.

  6. Greek numerals - Wikipedia

    en.wikipedia.org/wiki/Greek_numerals

    Greek numerals in a c. 1100 Byzantine manuscript of Hero of Alexandria's Metrika. The first line contains the number "͵θϡϟϛ δʹ ϛʹ", i.e. "9,996 + 1 ⁄ 4 + 1 ⁄ 6". It features each of the special numeral symbols sampi (ϡ), koppa (ϟ), and stigma (ϛ) in their minuscule forms. Greek numerals are decimal, based on powers of 10

  7. Psi (Greek) - Wikipedia

    en.wikipedia.org/wiki/Psi_(Greek)

    The Greek alphabet on a black-figure pottery vessel, with an archaic chickenfoot-shaped psi. Psi / ˈ ( p ) s aɪ , ˈ ( p ) s iː / (P)SY , (P)SEE [ 1 ] (uppercase Ψ , lowercase ψ or 𝛙 ; Greek : ψι psi [ˈpsi] ) is the twenty-third and penultimate letter of the Greek alphabet and is associated with a numeric value of 700.

  8. List of QWERTY keyboard language variants - Wikipedia

    en.wikipedia.org/wiki/List_of_QWERTY_keyboard...

    Though it is seldom used (most Dutch keyboards use US International layout), [10] the Dutch layout uses QWERTY and adds the € sign, the diaeresis ( ̈), the German eszett (ß), the pilcrow (¶), the (US) cent sign (¢), the Greek letter µ (for the micro-sign), the braces ({ }) and the guillemet quotation marks (« »), as well as having ...

  9. Greek alphabet - Wikipedia

    en.wikipedia.org/wiki/Greek_alphabet

    ea as in Scottish English great [15] [18] é as in French été. Similar to ay as in English overlay, but without pronouncing y. Ζ ζ: zeta, ζήτα [zd], or possibly : sd as in English wisdom, or possibly dz as in English adze [19] [20] [note 1] z as in English zoo: Η η: eta, ήτα : e as in English net, but long [22] ai as in English fairy