Look up Θ, θ in Wiktionary, the free dictionary.

Greek alphabet
Αα Alpha	Νν Nu
Ββ Beta	Ξξ Xi
Γγ Gamma	Οο Omicron
Δδ Delta	Ππ Pi
Εε Epsilon	Ρρ Rho
Ζζ Zeta	Σσ Sigma
Ηη Eta	Ττ Tau
Θθ Theta	Υυ Upsilon
Ιι Iota	Φφ Phi
Κκ Kappa	Χχ Chi
Λλ Lambda	Ψψ Psi
Μμ Mu	Ωω Omega
Obsolete letters
Ϝϝ Digamma	Ϙϙ Qoppa
Ϛϛ Stigma	Ϡϡ Sampi
Ϻϻ San	Ϸϸ Sho
Greek diacritics

Theta (uppercase Θ, lowercase θ or ϑ) is the eighth letter of the Greek alphabet, derived from the Phoenician letter Teth. In the system of Greek numerals it has a value of 9. In Classical Greek θ represented an aspirated voiceless dental plosive (/t̪ʰ/), but in Koiné and later dialects it became a voiceless dental fricative /θ/. In American English, the name of the letter is commonly pronounced [θeɪɾə]. In Modern Greek and British English, the name is pronounced [θiːtə]. Wikipedia does not have an article with this exact name. ... Wiktionary (a portmanteau of wiki and dictionary) is a multilingual, Web-based project to create a free content dictionary, available in over 150 languages. ... Image File history File links This is a lossless scalable vector image. ... The Greek alphabet is an alphabet that has been used to write the Greek language since about the 9th century BCE. It was the first alphabet in the narrow sense, that is, a writing system using a separate symbol for each vowel and consonant alike. ... Alpha (uppercase Α, lowercase α) is the first letter of the Greek alphabet. ... For other uses, see Nu. ... Beta (upper case Î’, lower case β) is the second letter of the Greek alphabet. ... Look up Ξ, ξ in Wiktionary, the free dictionary. ... Gamma (uppercase Γ, lowercase γ) is the third letter of the Greek alphabet. ... Look up Ο, ο in Wiktionary, the free dictionary. ... Look up Δ, δ in Wiktionary, the free dictionary. ... For other uses, see Pi (disambiguation) Pi (upper case Π, lower case Ï€ or Ï–) is the sixteenth letter of the Greek alphabet. ... Look up Ε, ε in Wiktionary, the free dictionary. ... Look up Ρ, ρ in Wiktionary, the free dictionary. ... Zeta or ZETA can refer to: // Zeta (letter), of the Greek alphabet Zeta functions, in mathematics Riemann zeta function Tropical Storm Zeta (2005), formed in December 2005 and lasted through January 2006 Z-pinch, in fusion power Zeta (Mexico), a magazine from Tijuana, Mexico Zeta River, in Montenegro Zeta plain... Look up Σ, σ, Ï‚ in Wiktionary, the free dictionary. ... Look up Η, η in Wiktionary, the free dictionary. ... Look up Τ, Ï„ in Wiktionary, the free dictionary. ... Upsilon (upper case , lower case ) is the 20th letter of the Greek alphabet. ... Look up Ι, ι in Wiktionary, the free dictionary. ... Look up Φ, φ in Wiktionary, the free dictionary. ... For other uses, see Kappa (disambiguation). ... Look up Χ, χ in Wiktionary, the free dictionary. ... Look up Λ, λ in Wiktionary, the free dictionary. ... Look up Ψ, ψ in Wiktionary, the free dictionary. ... Look up Îœ, μ in Wiktionary, the free dictionary. ... Look up Ω, ω in Wiktionary, the free dictionary. ... Digamma (upper case , lower case ) is an archaic letter of the Greek alphabet, used primarily as a Greek numeral. ... Qoppa Qoppa is an obsolete letter of the Greek alphabet and has a numeric value of 90. ... Stigma is a ligature of the Greek letters sigma and tau, sometimes used nowadays to represent the Greek numeral 6. ... Sampi (Upper case Ϡ, lower case ϡ) is an obsolete letter of the Greek alphabet and has a numeric value of 900. ... San (uppercase , lowercase ) was a letter of the Greek alphabet, appearing between Pi and Qoppa in alphabetical order, corresponding in position although not in name to the Phoenician tsade. ... Sho (uppercase , lowercase ) was a letter added to the Greek alphabet in order to write the Bactrian language. ... In the Greek alphabet, vowels can carry diacritics, namely accents and breathings. ... The word theta, and the Greek letter Θ or θ, are used for several things: Theta, the letter itself. ... The Greek alphabet is an alphabet that has been used to write the Greek language since about the 9th century BCE. It was the first alphabet in the narrow sense, that is, a writing system using a separate symbol for each vowel and consonant alike. ... (also Teth, Tet) is the ninth letter of many Semitic abjads, including Phoenician, Aramaic, Hebrew , Syriac and Arabic (in abjadi order, 16th in modern order). ... Greek numerals are a system of representing numbers using letters of the Greek alphabet. ... The History of Greece extends back to the arrival of the Greeks in Europe some time before 1500 BC, even though there has only been an independent state called Greece since Turkey, Italy and Libya. ... In phonetics, aspiration is the strong burst of air that accompanies the release of some obstruents. ... It has been suggested that this article or section be merged into Voiceless alveolar plosive. ... The voiceless dental non-sibilant fricative is a type of consonantal sound used in some spoken languages. ... Main article: Greek language Modern Greek (Νέα Ελληνικά or Νεοελληνική, lit. ... British English (BrE, BE, en-GB) is the broad term used to distinguish the forms of the English language used in the United Kingdom from forms used elsewhere in the Anglophone world. ...

Letters such as the early Cyrillic letter fita (Ѳ, ѳ) developed from θ.

In its archaic form, θ was written as: The archaic period in Greece is the period during which the ancient Greek city-states developed, and is normally taken to cover roughly the 9th century to the 6th century BCE. The Archaic period followed the dark ages, and saw significant advancements in political theory, and the rise of democracy...

• a cross within a circle ( or )

• and later, as a line or point within a circle ( or ).

According to Porphyry of Tyros, the Egyptians used an X within a circle as a symbol of the soul; having a value of nine, it was used as a symbol for Ennead. Johannes Lydus says that the Egyptians used a symbol for Kosmos in the form of theta, with a fiery circle representing the world, and a snake spanning the middle representing Agathos Daimon (literally: good spirit).^[1] Image File history File links Earth_symbol. ... Image File history File links Cross_within_circle_2. ... Image File history File links Line_within_circle. ... Image File history File links Sun_symbol. ... (For other meanings of Porphyr, see Porphyry) Porphyry (c. ... The Ennead (a word derived from Greek, meaning the nine) is a grouping of nine deities, most often used in the context of Egyptian mythology. ... Joannes Laurentius Lydus (The Lydian), Byzantine writer on antiquarian subjects, was born at Philadelphia in Lydia about AD 490. ... For other uses of the word, see cosmos (disambiguation) The cosmos is the universe, especially when thought of as an orderly or harmonious system. ... Agathodaemon is also the name of a canal on Mars. ...

The Egyptians also used the symbol of a point within a circle ( , the sun disc) to represent the sun, which might be a possible origin of its use as the Sun's astrological glyph. It is worthwhile to note that θῆτα (theta) has the same numerical value in isopsephy as Ηλιος (Helios): 318. Image File history File links Sun_symbol. ... An astrological chart (or horoscope) _ Y2K Chart — This particular chart is calculated for January 1, 2000 at 12:01:00 A.M. Eastern Standard Time in New York City, New York, USA. (Longitude: 074W0023 - Latitude: 40N4251) Astrology (from Greek: αστρολ&#959... Isopsephy (iso meaning equal and psephos meaning pebble) is the Greek language word for the practice of adding up the number values of the letters in a word to form a single number. ... For other uses, see Helios (disambiguation). ...

In classical Athens, it was used as an abbreviation for the Greek θάνατος (thanatos, "death") and as it vaguely resembles a human skull, theta was used as a warning symbol of death, in the same way that skull and crossbones are used in modern times. It survives on potsherds used by Athenians when voting for the death penalty.^[1] In Greek mythology, Thanatos (in Ancient Greek, θάνατος – Death) was the Daimon personification of Death and Mortality. ... This article does not cite any references or sources. ... In archaeology, a sherd is a fragment of pottery or other ceramic. ... Capital punishment, or the death penalty, is the execution of a convicted criminal by the state as punishment for crimes known as capital crimes or capital offences. ...

Symbol

The remainder of this article may require cleanup to meet Wikipedia's quality standards. Please improve this article if you can.

The lower-case letter θ is used as a symbol for: Image File history File links Broom_icon. ...

• A plane angle in geometry.
• The voiceless dental fricative in the International Phonetic Alphabet, such as in the words thick or thin (but not as in the, which is the voiced dental fricative).
• The Potential temperature in meteorology.
• The score of a test taker in item response theory.
• Theta Type Replication - a type of bacterial DNA replication specific to circular chromosomes
• Theta has also gained a new significance, in the north-eastern region of the United States, as a symbol for affection, in a similar capacity to the "heart" symbol.^{[citation needed]}

The upper-case letter Θ is used as a symbol for: This article is about angles in geometry. ... The voiceless dental non-sibilant fricative is a type of consonantal sound used in some spoken languages. ... Articles with similar titles include the NATO phonetic alphabet, which has also informally been called the “International Phonetic Alphabet”. For information on how to read IPA transcriptions of English words, see IPA chart for English. ... The voiced dental non-sibilant fricative is a type of consonantal sound, used in some spoken languages. ... The potential temperature of a parcel of air at pressure is the temperature that the parcel would acquire if adiabatically brought to a standard reference pressure , usually 1 bar. ... // Meteorology (from Greek: μετέωρον, meteoron, high in the sky; and λόγος, logos, knowledge) is the interdisciplinary scientific study of the atmosphere that focuses on weather processes and forecasting. ... Item response theory (IRT) is a body of related psychometric theory that provides a foundation for scaling persons and items based on responses to assessment items. ... It has been suggested that DNA replicate, Replisome, Replication fork, Lagging strand, Leading strand be merged into this article or section. ... This article is about the biological chromosome. ...

• Dimensionless temperature in transport phenomena.
• Big O notation. Denoting an asymptotically tight bound in analysis of algorithms.
• Θ (set theory), a certain ordinal number.
• Representing pentaquarks, exotic baryons in particle physics.
• Earth Day.
• Brainwave Frequency (Beta, Alpha, Theta, Delta) ranging from 4-8 Hz

The first edition of Transport Phenomena was published in 1960, two years after having been preliminarily published under the title Notes on Transport Phenomena based on mimeographed notes prepared for a chemical engineering course taught at the University of Wisconsin during the academic year 1957-1958. ... For other uses, see Big O. In computational complexity theory, big O notation is often used to describe how the size of the input data affects an algorithms usage of computational resources (usually running time or memory). ... In set theory, Θ is the least ordinal α such that there is no surjection from the reals onto α. If the axiom of choice (AC) holds (or even if the reals can be wellordered) then Θ is simply , the cardinal successor of the cardinality of the continuum. ... In set theory, ordinal, ordinal number, and transfinite ordinal number refer to a type of number introduced by Georg Cantor in 1897, to accommodate infinite sequences and to classify sets with certain kinds of order structures on them. ... A pentaquark is a subatomic particle consisting of a group of five quarks (compared to three quarks in normal baryons and two in mesons), or more specifically four quarks and one anti-quark. ... Combinations of three u, d or s-quarks with a total spin of 3/2 form the so-called baryon decuplet. ... Thousands of particles explode from the collision point of two relativistic (100 GeV per nucleon) gold ions in the STAR detector of the Relativistic Heavy Ion Collider. ... Earth Day Flag. ... “EEG” redirects here. ...

In options investing

Theta is known as an option Greek measuring the rate of time decay on a daily basis. One can look at this as an ice cube melting in your hand. A Theta of -.05 means that the option is losing a nickel of time value each day. Other option Greeks include Delta, Vega, Rho and Gamma.^{[citation needed]}

See also: Greeks (finance)

In mathematical finance, the Greeks are the quantities representing the market sensitivities of options or other derivatives. ...

In popular sociology

Theta is used colloquially to refer to the quotient of a person's appearance versus time.^{[citation needed]} Similar to the Options investing as a description of the effect of time on price, Theta in this sense describes the effect of time on appearance. For example, a 50-year old woman, who looks as if she were 40 years old, would have a Theta of (50/40=1.20). An excellent example is Vanna White, who appears approximately 10 years younger than her calendar age. Theta is a desirable quality; people generally are more attracted to a person with good theta than those who look their age.

Usage in names

• Theta Sigma is one of the nicknames of the Doctor of the television series Doctor Who.
• Kappa Alpha Theta is a sorority whose members are designated "Thetas".
• Theta is also the name of a melodic death metal band based in Plattsburgh, New York.
• Theta is the name of a biological weapon and boss featured in the Atari video game Area 51.^{[citation needed]}

For other uses, see Doctor Who (disambiguation). ... Kappa Alpha Theta (ΚΑΘ) is an international womens fraternity founded on January 27, 1870 at DePauw University. ... While the term fraternity can be used to describe any number of social organizations, including the Lions Club and the Shriners, fraternities and sororities are most commonly known as social organizations of higher education students in the United States and Canada but there are fraternities in the whole world (for... Melodic death metal, (also referred to as Gothenburg metal, melodeath, and post-death) is a subgenre of death metal. ... Plattsburgh, New York refers to two locations in Clinton County, New York: City of Plattsburgh Town of Plattsburgh This is a disambiguation page — a navigational aid which lists other pages that might otherwise share the same title. ... Area 51 is a first-person shooter developed in tandem for the PlayStation 2, Xbox, and PC, and is loosely based on the 1996 light gun video game Area 51. ...

Footnote

To add the symbol into a document, type Alt-0415 (MS Word 2003 SP2 tested only).

References

• Barry, Kieren (1999), The Greek Qabalah, Samuel Weiser, ISBN 1-57863-110-6.