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  2. Delta Sigma Pi - Wikipedia

    en.wikipedia.org/wiki/Delta_Sigma_Pi

    The badge of Delta Sigma Pi is a skull and crossbones, superimposed on a wreath of leaves. The letters Δ, Σ, and Π are inscribed on the skull, set with amethyst eyes, a crown on top highlighted in red lacquer, often enhanced with surrounding pearls. [3] The colors of Delta Sigma Pi are old gold and royal purple. [3]

  3. Greek alphabet - Wikipedia

    en.wikipedia.org/wiki/Greek_alphabet

    The letter delta has a form resembling a cursive capital letter D; ... ("variant pi") is an archaic script form of pi ... The letter sigma, in standard orthography, ...

  4. 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.

  5. List of Greek letters - Wikipedia

    en.wikipedia.org/wiki/List_of_Greek_letters

    Archaic letter denoting the presence of /h/ prior to the vowel, with a high pitch on a short vowel or rising pitch on a long vowel Ὃὃ: Omicron with grave and rough breathing: Archaic letter denoting the presence of /h/ prior to the vowel, with a normal or low pitch Π̌π̌: Pi with caron: Nonstandard letter for Cypriot Greek representing ...

  6. Glossary of mathematical symbols - Wikipedia

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

    Historically, upper-case letters were used for representing points in geometry, and lower-case letters were used for variables and constants. Letters are used for representing many other sorts of mathematical objects. As the number of these sorts has remarkably increased in modern mathematics, the Greek alphabet and some Hebrew letters are

  7. Pi (letter) - Wikipedia

    en.wikipedia.org/wiki/Pi_(letter)

    Pi (/ˈpaɪ/; Ancient Greek /piː/ or /peî/, uppercase Π, lowercase π, cursive ϖ; Greek: πι) is the sixteenth letter of the Greek alphabet, representing the voiceless bilabial plosive IPA:. In the system of Greek numerals it has a value of 80.

  8. High school fraternities and sororities - Wikipedia

    en.wikipedia.org/wiki/High_school_fraternities...

    It became ΤΔΦ - Tau Delta Phi collegiate fraternity. [2] [a] Phi Sigma Chi, (ΦΣΧ) was founded on November 28, 1900, in Zanesville, Ohion. It chartered 117 chapter, possibly the most chapters of high school fraternity. Pi Phi (ΠΦ) was founded in 1878 at Rochester Free Academy which was associated with the University of Rochester. Pi Phi ...

  9. Delta (letter) - Wikipedia

    en.wikipedia.org/wiki/Delta_(letter)

    Delta (/ ˈ d ɛ l t ə /; [1] uppercase Δ, lowercase δ; Greek: δέλτα, délta, ) [2] is the fourth letter of the Greek alphabet. In the system of Greek numerals it has a value of 4. It was derived from the Phoenician letter dalet 𐤃. [ 3 ]