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  2. Sigma - Wikipedia

    en.wikipedia.org/wiki/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. In the system of Greek numerals , it has a value of 200.

  3. 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.

  4. Standard deviation - Wikipedia

    en.wikipedia.org/wiki/Standard_deviation

    Standard deviation may be abbreviated SD or std dev, and is most commonly represented in mathematical texts and equations by the lowercase Greek letter σ (sigma), for the population standard deviation, or the Latin letter s, for the sample standard deviation.

  5. What do teens mean when they say ‘sigma’? - AOL

    www.aol.com/news/teens-mean-sigma-000158935.html

    Some know “sigma” as the 18th letter of the Greek alphabet but it’s also teen slang for a cool dude. According to Know Your Meme, sigma is “referring to a supposed classification for men ...

  6. Glossary of mathematical symbols - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_mathematical...

    A mathematical symbol is a figure or a combination of figures that is used to represent a mathematical object, an action on mathematical objects, a relation between mathematical objects, or for structuring the other symbols that occur in a formula.

  7. Christogram - Wikipedia

    en.wikipedia.org/wiki/Christogram

    In Eastern Christianity, the most widely used Christogram is a four-letter abbreviation, ΙϹ ΧϹ—a traditional abbreviation of the Greek words for 'Jesus Christ' (i.e., the first and last letters of each of the words ΙΗϹΟΥϹ ΧΡΙϹΤΟϹ, with the lunate sigma 'Ϲ' common in medieval Greek), [23] and written with titlo (diacritic ...

  8. A trove of new slang by Gen Alpha is leaving their millennial ...

    www.aol.com/news/parents-gen-alpha-kids-having...

    Sigma,” for example, means someone who is cool or a leader, kids said. “Ohio,” on the other hand, means weird or cringe — based on memes that reference “only in Ohio” type of ...

  9. List of common physics notations - Wikipedia

    en.wikipedia.org/wiki/List_of_common_physics...

    Symbol Name Meaning SI unit of measure nabla dot : the divergence operator often pronounced "del dot" per meter (m −1) : nabla cross : the curl operator often pronounced "del cross"