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

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

    Greek letters are used in mathematics, science, engineering, and other areas where mathematical notation is used as symbols for constants, special functions, and also conventionally for variables representing certain quantities. In these contexts, the capital letters and the small letters represent distinct and unrelated entities.

  3. Template:Varsigma - Wikipedia

    en.wikipedia.org/wiki/Template:Varsigma

    This template displays the Greek letter sigma for use in mathematical equations. Template parameters [Edit template data] Parameter Description Type Status No italic noitalic Whether or not the character displayed is not italic. Unknown optional bold bold Whether to use the variation of the character that is bold. Note: Not every symbol has a corresponding bold character. Unknown optional See ...

  4. Sigma bond - Wikipedia

    en.wikipedia.org/wiki/Sigma_bond

    The symbol σ is the Greek letter sigma. When viewed down the bond axis, a σ MO has a circular symmetry , hence resembling a similarly sounding "s" atomic orbital . Typically, a single bond is a sigma bond while a multiple bond is composed of one sigma bond together with pi or other bonds.

  5. Template:Sigma - Wikipedia

    en.wikipedia.org/wiki/Template:Sigma

    This template displays the Greek letter sigma for use in mathematical equations. Template parameters [Edit template data] Parameter Description Type Status Uppercase uc uppercase Whether or not the character displayed is uppercase. Unknown optional No italic noitalic Whether or not the character displayed is not italic. Unknown optional var var Whether to use the variation of the character for ...

  6. Molecular orbital diagram - Wikipedia

    en.wikipedia.org/wiki/Molecular_orbital_diagram

    In contrast to the sigma 1s MO's, the σ 2p has some non-bonding electron density at either side of the nuclei and the σ* 2p has some electron density between the nuclei. The other two p-orbitals, p y and p x, can overlap side-on. The resulting bonding orbital has its electron density in the shape of two lobes above and below the plane of the ...

  7. Sigma - Wikipedia

    en.wikipedia.org/wiki/Sigma

    The letter Sigma. Sigma (/ ˈ s ɪ ɡ m ə / SIG-mə; [1] uppercase Σ, lowercase σ, lowercase in word-final position ς; Ancient Greek: σίγμα) is the eighteenth letter of the Greek alphabet.

  8. Chemical equation - Wikipedia

    en.wikipedia.org/wiki/Chemical_equation

    A chemical equation is the symbolic representation of a chemical reaction in the form of symbols and chemical formulas.The reactant entities are given on the left-hand side and the product entities are on the right-hand side with a plus sign between the entities in both the reactants and the products, and an arrow that points towards the products to show the direction of the reaction. [1]

  9. Mathematical operators and symbols in Unicode - Wikipedia

    en.wikipedia.org/wiki/Mathematical_operators_and...

    greek beta symbol u+03d1: ϑ: greek theta symbol u+03d2: ϒ: greek upsilon with hook symbol u+03d5: ϕ: greek phi symbol u+03f0: ϰ: greek kappa symbol u+03f1: ϱ: greek rho symbol u+03f4: ϴ: greek capital theta symbol u+03f5: ϵ: greek lunate epsilon symbol u+03f6 ϶ greek reversed lunate epsilon symbol