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  2. Greek alphabet - Wikipedia

    en.wikipedia.org/wiki/Greek_alphabet

    This writing system, unrelated to the Greek alphabet, last appeared in the thirteenth century BC. In the late ninth century BC or early eighth century BC, the Greek alphabet emerged. [ 2 ] The period between the use of the two writing systems, during which no Greek texts are attested, is known as the Greek Dark Ages.

  3. List of Greek letters - Wikipedia

    en.wikipedia.org/wiki/List_of_Greek_letters

    Eta with acute and smooth breathing. Archaic letter denoting the absence of /h/ prior to the vowel, with a high pitch on a short vowel or rising pitch on a long vowel. Ἢἢ. Eta with grave and smooth breathing. Archaic letter denoting the absence of /h/ prior to the vowel, with a normal or low pitch. Ἦἦ.

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

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

    t. e. 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. Pi - Wikipedia

    en.wikipedia.org/wiki/Pi

    [3] [106] The Greek letter appears on p. 243 in the phrase "Periphery (π)", calculated for a circle with radius one. However, Jones writes that his equations for π are from the "ready pen of the truly ingenious Mr. John Machin ", leading to speculation that Machin may have employed the Greek letter before Jones. [ 102 ]

  6. Pi (letter) - Wikipedia

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

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

  7. 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]

  8. Glossary of mathematical symbols - Wikipedia

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

    Glossary of mathematical symbols. 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. As formulas are entirely constituted with symbols of various ...

  9. Archaic Greek alphabets - Wikipedia

    en.wikipedia.org/wiki/Archaic_Greek_alphabets

    The archaic letter Koppaor Qoppa (Ϙ), used for the back allophoneof /k/ before back vowels[o, u], was originally common to most epichoric alphabets. It began to drop out of use from the middle of the 6th century BC. Some of the Doric regions, notably Corinth, Argos, Crete and Rhodes, kept it until the 5th century BC.