Theta

The title of this article is ambiguous. Further meanings are listed under Theta (disambiguation) .

Theta
pronunciation
antique	[ t h ] ​​
modern	[ θ ] ​​
Equivalents
Latin	Þ
Cyrillic	Ѳ
Hebrew	ט
Arabic	ﻁ
Phoenician	?
transcription
From the ancient world	th
From the modern	th
Coding Capitals Unicode number U + 0398 Unicode name GREEK CAPITAL LETTER THETA HTML & # 920; HTML entity ? Minuscule Unicode number U + 03B8 Unicode name GREEK SMALL LETTER THETA HTML & # 952; HTML entity ? Variation 1 Unicode number U + 03D1 Unicode name GREEK THETA SYMBOL HTML & # 977; HTML entity ? 1 More used in the literal area

The theta ( Greek neuter θῆτα , Majuskel Θ, minuscule θ or θ) is the eighth letter of the Greek alphabet , and has according to the Milesian system the numerical value. 9

In modern Greek the letter θήτα is called thíta and is pronounced like a sharp English th ( voiceless dental fricative , "Lispellaut").

use

• In physics
  • the small theta θ is the symbol for the Celsius temperature , whereby the second variant of the small theta ϑ is often used here;
  • the small theta θ is the symbol for the twist angle ;
  • the big theta Θ is the symbol for the magnetic flow as well as for the moment of inertia ;
  • the great theta Θ is the dimensional symbol for temperature ;
  • the large theta Θ is the symbol for the contact angle at phase boundaries.

• In astronomy
  • the great theta Θ is the sign for the sidereal time - just like in geodesy ;
  • the small theta ϑ is usually the seventh to ninth brightest star in the respective constellation ;
  • Theta serves as a more detailed description of two meteor streams ( Theta Centaurids and Theta Ophiuchids ) in order to describe the position of the radiant in these large constellations more precisely.

• In meteorology
  • the small theta θ is the symbol for the potential temperature .

• In math
  • the small theta θ is the coordinate of the polar angle for spherical coordinates ;
  • the small theta θ is the symbol for the angle of a surface;
  • the great theta Θ is one of the Landau symbols ;
  • some functions are called theta function ;
  • the small theta θ is the designation for an unknown parameter of a probability distribution , the large theta Θ for the parameter space.

• In financial mathematics
  • In the case of warrants , this key figure measures the decay in the fair value of an option . The theta indicates how much a warrant, if all other factors remain the same (ceteris paribus), loses value in a certain period of time. In practice, the percentage decline in value per week is compared.

• In the International Phonetic Alphabet
  • the little Theta referred [⁠ .theta ⁠] the voiceless dental fricative , such as in English. Word theft [θɛft, theft].

• In neurology / neuropsychology
  • the small theta θ denotes a certain frequency in the electroencephalogram (EEG).

• In economics
  • The small theta θ denotes the reserve ratio that a financial institution has to hold due to legal requirements.

• In population genetics
  • the small theta θ denotes the genetic differentiation between populations (analogous to Wright's F _ST ).

• In soil science
  • the major theta denotes the volumetric water content : ${\displaystyle {\mathit {\Theta }}={\frac {V_{\text{w}}}{V_{\text{b}}}}={\frac {\text{Volumen des Wassers}}{\text{Volumen des Bodens}}}}$

• In geodesy
  • the small theta ϑ is the total amount of deviation from the perpendicular .

Examples

• Thales of Miletus ( Θαλῆς )

Web links

Commons : Theta  - collection of images, videos and audio files

Wiktionary: Theta  - explanations of meanings, word origins, synonyms, translations