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Phi (/ f aɪ /; [1] uppercase Φ, lowercase φ or ϕ; Ancient Greek: ϕεῖ pheî; Modern Greek: φι fi) is the twenty-first letter of the Greek alphabet. In Archaic and Classical Greek (c. 9th to 4th century BC), it represented an aspirated voiceless bilabial plosive ( [pʰ] ), which was the origin of its usual romanization as ph .
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.
The letter phi can occur in two equally frequent stylistic variants, either shaped as (a circle with a vertical stroke through it) or as (a curled shape open at the top). The symbol ϕ (U+03D5) is designated specifically for the closed form, used as a technical symbol.
Greek letter Φ: majuscule U+03A6 Φ GREEK CAPITAL LETTER PHI and minuscule U+03C6 φ GREEK SMALL LETTER PHI are a part of the Greek alphabet. It sometimes take the form of U+03D5 ϕ GREEK PHI SYMBOL and is used as a sign in different fields of studies. The U+0278 ɸ LATIN SMALL LETTER PHI is used in the IPA for voiceless bilabial fricative.
Archaic letter denoting the presence of /h/ prior to a long diphthong, with a normal or low pitch ᾟᾗ: Eta with subscript iota and circumflex and rough breathing: Archaic letter denoting the presence of /h/ prior to a long diphthong, with a high or falling pitch Ίί: Iota with acute: High pitch on short vowel or rising pitch on long vowel ...
greek capital letter phi Ω u+03a9: 234: greek capital letter omega α u+03b1: 224: greek small letter alpha δ u+03b4: 235: greek small letter delta ε u+03b5: 238: greek small letter epsilon π u+03c0: 227: greek small letter pi σ u+03c3: 229: greek small letter sigma τ u+03c4: 231: greek small letter tau φ u+03c6: 237: greek small letter ...
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Modifier letter small turned w Used in linguistic transcriptions of Scots [34] ꭖ X with low right ring Teuthonista [4] ꭗ X with long left leg ꭘ X with long left leg and low right ring ꭙ X with long left leg with serif ꭙ̆: X with long left leg with serif and breve The reference does not cite this letter and diacritic combination ...