Unknown

Unknown or The Unknown may refer to:

Mathematics

Film

Music

Other uses

Amnesia: The Dark Descent

Amnesia: The Dark Descent is a survival horror video game by Frictional Games, released for Microsoft Windows, Mac OS X, and Linux platforms. The game features a protagonist named Daniel exploring a dark and foreboding castle, while avoiding monsters and other obstructions as well as solving puzzles. The game was critically well received, earning two awards from the Independent Games Festival and numerous positive reviews.

Originally released independently as a download, the game has since been published in retail by 1C Company in Russia and Eastern Europe, as well as THQ in North America. A collection of five short stories set in the world of Amnesia, written by Mikael Hedberg and illustrated by the game's concept artists, was also made available. In addition, the game's soundtrack is available for purchase and a free content expansion called "Justine" has been released as well as many fan-made expansions and stories for its unique "Custom Story" gamemode.

Gameplay

Placeholder name

Placeholder names are words that can refer to objects or people whose names are temporarily forgotten, irrelevant, or unknown in the context in which they are being discussed.

Linguistic role

These placeholders typically function grammatically as nouns and can be used for people (e.g. John Doe, Jane Doe), objects (e.g. widget) or places (e.g. Anytown, USA). They share a property with pronouns, because their referents must be supplied by context; but, unlike a pronoun, they may be used with no referent—the important part of the communication is not the thing nominally referred to by the placeholder, but the context in which the placeholder occurs.

Stuart Berg Flexner and Harold Wentworth's Dictionary of American Slang (1960) use the term kadigan for placeholder words. They define "kadigan" as a synonym for thingamajig. The term may have originated with Willard R. Espy, though others, such as David Annis, also used it (or cadigans) in their writing. Its etymology is obscure—Flexner and Wentworth related it to the generic word gin for engine (as in the cotton gin). It may also relate to the Irish surname Cadigan. Hypernyms (words for generic categories; e.g. "flower" for tulips and roses) may also be used in this function of a placeholder, but they are not considered to be kadigans.

Greeks (finance)

In mathematical finance, the Greeks are the quantities representing the sensitivity of the price of derivatives such as options to a change in underlying parameters on which the value of an instrument or portfolio of financial instruments is dependent. The name is used because the most common of these sensitivities are denoted by Greek letters (as are some other finance measures). Collectively these have also been called the risk sensitivities,risk measures or hedge parameters.

Use of the Greeks

The Greeks are vital tools in risk management. Each Greek measures the sensitivity of the value of a portfolio to a small change in a given underlying parameter, so that component risks may be treated in isolation, and the portfolio rebalanced accordingly to achieve a desired exposure; see for example delta hedging.

The Greeks in the Black–Scholes model are relatively easy to calculate, a desirable property of financial models, and are very useful for derivatives traders, especially those who seek to hedge their portfolios from adverse changes in market conditions. For this reason, those Greeks which are particularly useful for hedging—such as delta, theta, and vega—are well-defined for measuring changes in Price, Time and Volatility. Although rho is a primary input into the Black–Scholes model, the overall impact on the value of an option corresponding to changes in the risk-free interest rate is generally insignificant and therefore higher-order derivatives involving the risk-free interest rate are not common.

Gamma (store)

Gamma is a Dutch Hardware store-chain. It started in May 11, 1978 in Breda. The headquarters of the franchise-organisation Intergamma is located in Leusden and as of 2011 it has 245 stores, of which 164 are located in the Netherlands and 81 in Belgium. Intergamma also owns the Hardware store-chain Karwei.

History

In 2008 Gamma had a revenue of 606 million euro.

Gamma commercials have been broadcast in the Netherlands on radio and television since 1994, and have made the actors John Buijsman and Martin van Waardenberg well known in the Netherlands. In Flanders Luk Wyns is the face of the company.

External links

References

Gamma (disambiguation)

Gamma is the third letter of the Greek alphabet.

Gamma may also refer to:

Science and mathematics

General

Lower case, γ