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There are also some archaic letters and Greek-based technical symbols. This block also supports the Coptic alphabet. Formerly, most Coptic letters shared codepoints with similar-looking Greek letters; but in many scholarly works, both scripts occur, with quite different letter shapes, so as of Unicode 4.1, Coptic and Greek were disunified.
In algebraic topology, Chi is used to represent the Euler characteristic of a surface. In neuroanatomy, crossings of peripheral nerves (such as the optic chiasm) are named for the letter Chi because of its Χ-shape. [5] In chemistry, the mole fraction [6] [7] and electronegativity [8] may be denoted by the lowercase .
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.
The first line contains the number " ͵θϡϟϛ δʹ ϛʹ ", i.e. " 9,996 + 1⁄4 + 1⁄6 ". It features each of the special numeral symbols sampi (ϡ), koppa (ϟ), and stigma (ϛ) in their minuscule forms. Greek numerals are decimal, based on powers of 10. The units from 1 to 9 are assigned to the first nine letters of the old Ionic alphabet ...
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.
Xi ( UK: / zaɪ /, US: / ksaɪ /; [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 .
The rough breathing (Ancient Greek: δασὺ πνεῦμα, romanized: dasù pneûma; Latin spīritus asper )—' ἁ '—indicates a voiceless glottal fricative ( /h/) before the vowel in Ancient Greek. In Greek grammar, this is known as aspiration. This is different from aspiration in phonetics, which applies to consonants, not vowels.
The letter now known as sigma took its name from sāmekh but its form from šin, while the letter San, which occurred in a few dialects only, took its name from šin but its place in the alphabet from ṣādē. A further Greek letter of uncertain origin, sampi, is found occasionally, and may represent an affricate, such as [t͡s].