*Letters with a similar style:*

**Ѳ · ѳ · Ө · ө · Ɵ · ɵ · ፀ**

**Θ** , **θ** (name: **theta** , Greek. Θήτα, other Greek. Θῆτα ) - the 8th letter of the Greek alphabet . In the Greek alphabetical system of numbers, it has a numerical value of 9. It comes from the Phoenician letter - tet . From the letter theta came the cyrillic letter Ѳ (fita) . The modern Greek name is **phyta** [ˈθi.ta] . In ancient Greek, it sounded like an aspirated [ t ʰ ], then moved to [ θ ].

Theta Greek letter | |||||||||||||||||||||||||||||||||||||||||||||
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Θθϴϑ | |||||||||||||||||||||||||||||||||||||||||||||

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Title | Θ : greek capital letter thetaθ : greek small letter thetaϴ : greek small letter thetaϑ : greek theta symbol | ||||||||||||||||||||||||||||||||||||||||||||

Unicode | Θ : U + 0398θ : U + 03B8ϴ : U + 03F4ϑ : U + 03D1 | ||||||||||||||||||||||||||||||||||||||||||||

HTML code | Θ : `Θ` or `Θ` θ : `θ` or `θ` ϴ : `ϴ` or `ϴ` ϑ : `ϑ` or `ϑ` | ||||||||||||||||||||||||||||||||||||||||||||

Utf-16 | Θ : 0x398θ : 0x3B8ϴ : 0x3F4ϑ : 0x3D1 | ||||||||||||||||||||||||||||||||||||||||||||

Url | Θ :% CE% 98θ :% CE% B8ϴ :% CF% B4ϑ :% CF% 91 | ||||||||||||||||||||||||||||||||||||||||||||

Mnemonics | Θ : `Θ` θ `θ` ϑ : `ϑ` |

## Cyrillic Fita

In the pre-revolutionary spelling of the Russian language, borrowed from the Greek word with a theta was transmitted through phyta (for example, the Greek Greek Θῆβαι as “ Ѳiva ”, ὀρθογραφία as “orography”, Θεσσαλία as “ ѲESSALIA ”).

## Application

- In the worldwide phonetic transcription ( International Phonetic Alphabet ), the Greek letter theta represents a muffled dental crevice consonant . In the past, the sign þ was used for this purpose.
- The symbol is used to denote the temperature in physics, in particular the Debye characteristic temperature .
- This letter denotes the zenith angle in a spherical coordinate system .
- In electromechanics, this letter denotes the load angle of a synchronous electric motor.
- In sopromat, this letter denotes the angles of rotation of the beam bending under load.
- One of the EEG rhythms in medicine is the theta rhythm .
- A capital letter denotes an expansion parameter in internal ballistics .
- In Scientology, the Greek word for theta (and the letter Θ) is used as a symbol for designating thought as “energy”.
- In theory, complexity analysis of algorithms denotes the time complexity of an algorithm.
- In linear algebra is one of the notation of the zero matrix
^{[1]}. - In O-notation, denotes a function asymptotically equivalent to a given one.
- In mathematics, there is a Theta function .
- In colloid chemistry, the surface area of the adsorbent occupied by surfactant molecules is indicated.

## Notes

- ↑ How to find the rank of a matrix? Detailed examples of solutions . www.mathprofi.ru. Date of treatment March 10, 2016.