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The uppercase letter Η is used as a symbol in textual criticism for the Alexandrian text-type (from Hesychius, its once-supposed editor). In chemistry , the letter H as symbol of enthalpy sometimes is said to be a Greek eta, but since enthalpy comes from ἐνθάλπος, which begins in a smooth breathing and epsilon, it is more likely a ...
Symbol Name Meaning SI unit of measure alpha: alpha particle: angular acceleration: radian per second squared (rad/s 2) fine-structure constant: unitless beta: velocity in terms of the speed of light c: unitless beta particle: gamma: Lorentz factor: unitless photon: gamma ray: shear strain: radian
Eta with circumflex and rough breathing: Archaic letter denoting the presence of /h/ prior to the vowel, with a high or falling pitch ῌῃ: Eta with subscript iota: Archaic letter denoting a long diphthong ῄ: Eta with subscript iota and acute: Archaic letter denoting a long diphthong with a rising pitch ῂ: Eta with subscript iota and grave
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.
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Typographical symbols and punctuation marks are marks and symbols used in typography with a variety of purposes such as to help with legibility and accessibility, or to identify special cases. This list gives those most commonly encountered with Latin script. For a far more comprehensive list of symbols and signs, see List of Unicode characters.
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During the classical era, more dialects adopted the new Ionian vocalic Eta (as Athens did around c. 400 BC). As many of these dialects nevertheless still also pronounced /h/ , they faced the problem of distinguishing between their own old consonantal symbol and the new vocalic symbol.