# Theta

Theta
pronunciation
antique [ t h ]
modern [ θ ]
Equivalents
Latin Þ
Cyrillic Ѳ
Hebrew ט
Arabic
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 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 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 economics
• The small theta θ denotes the reserve ratio that a financial institution has to hold due to legal requirements.
• In soil science
• the major theta denotes the volumetric water content :${\ displaystyle {\ mathit {\ Theta}} = {\ frac {V _ {\ text {w}}} {V _ {\ text {b}}}} = {\ frac {\ text {Volume of the water}} { \ text {Volume of the soil}}}}$

## Examples

• Thales of Miletus ( Θαλῆς )