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The Greek alphabet has been used to write the Greek language since the late 9th or early 8th century BC. [3] [4] It is derived from the earlier Phoenician alphabet, [5] and was the earliest known alphabetic script to have distinct letters for vowels as well as consonants.
Sigma (/ ˈsɪɡmə / SIG-mə; [1] uppercase Σ, lowercase σ, lowercase in word-final position ς; Greek: σίγμα) is the eighteenth letter of the Greek alphabet. In the system of Greek numerals, it has a value of 200. In general mathematics, uppercase Σ is used as an operator for summation.
Epsilon with acute and rough breathing. 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. Ἓἓ. Epsilon with grave and rough breathing. Archaic letter denoting the presence of /h/ prior to the vowel, with a normal or low pitch. Ε̠ε̠.
The history of the Greek alphabet starts with the adoption of Phoenician letter forms in the 9th–8th centuries BC during early Archaic Greece and continues to the present day. The Greek alphabet was developed during the Iron Age, centuries after the loss of Linear B, the syllabic script that was used for writing Mycenaean Greek until the Late ...
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.
Greek alphabet. Many local variants of the Greek alphabet were employed in ancient Greece during the archaic and early classical periods, until around 400 BC, when they were replaced by the classical 24-letter alphabet that is the standard today. All forms of the Greek alphabet were originally based on the shared inventory of the 22 symbols of ...
In physics, denotes electric or magnetic susceptibility. In rhetoric, both chiastic structure (a literary device) and the figure of speech Chiasmus derive from their names from the shape of the letter Chi. In mechanical engineering, chi is used as a symbol for the reduction factor of relevant buckling loads in the EN 1993, a European Standard ...
Xi (/ zaɪ / ZY or / (k) saɪ / (K)SY; [1][2] uppercase Ξ, lowercase ξ; Greek: ξι) is the fourteenth letter of the Greek alphabet, representing the voiceless consonant cluster [ks]. Its name is pronounced [ksi] in Modern Greek. In the system of Greek numerals, it has a value of 60. Xi was derived from the Phoenician letter samekh .