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Greek also introduced three new consonant letters for its aspirated plosive sounds and consonant clusters: Φ for /pʰ/, Χ for /kʰ/ and Ψ for /ps/. In western Greek variants, Χ was instead used for /ks/ and Ψ for /kʰ/. The origin of these letters is a matter of some debate.
Greek alphabet. Chi ( / ˈkaɪ, ˈxiː / ⓘ; [ 1][ 2] uppercase Χ, lowercase χ; Greek: χῖ) is the twenty-second letter of the Greek alphabet .
Alpha 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. Ἂἂ. Alpha with grave and smooth breathing. Archaic letter denoting the absence of /h/prior to the vowel, with a normal or low pitch. Ἆἆ.
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 .
X, or x, is the twenty-fourth letter of the Latin alphabet, used in the modern English alphabet, the alphabets of other western European languages and others worldwide. Its name in English is ex (pronounced / ˈ ɛ k s / ), plural exes .
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 ...
Christian cross variants. 7th-century Byzantine solidus, showing Leontius holding a globus cruciger, with a stepped cross on the obverse side. Double-barred cross symbol as used in a 9th-century Byzantine seal. Greek cross ( Church of Saint Sava) and Latin cross ( St. Paul's cathedral) in church floorplans. The Christian cross, with or without ...