Keychain

A keychain or key chain is a small chain, usually made from metal or plastic, that connects a small item to a keyring. The length of a keychain allows an item to be used more easily than if connected directly to a keyring. Some keychains allow one or both ends the ability to rotate, keeping the keychain from becoming twisted, while the item is being used. A keychain can also be a connecting link between a keyring and the belt of an individual. It is usually employed by personnel whose job demands frequent use of keys, such as a security guard, prison officer, janitor, or retail store manager. The chain is often retractable, and therefore may be a nylon rope, instead of an actual metal chain. The chain ensures that the keys remain attached to the individual using them, makes accidental loss less likely, and saves on wear and tear on the pockets of the user.

Spelling

Some spell checkers and dictionaries do not recognize the spelling "keychain," but separate the word into "key chain." Keychain collectors and many other people prefer to use it as a compound word ("keychain").

*-algebra

In mathematics, and more specifically in abstract algebra, a *-algebra (or involutive algebra) is a mathematical structure consisting of two involutive rings R and A, where R is commutative and A has the structure of an associative algebra over R. Involutive algebras generalize the idea of a number system equipped with conjugation, for example the complex numbers and complex conjugation, matrices over the complex numbers and conjugate transpose, and linear operators over a Hilbert space and Hermitian adjoints.

Terminology

*-ring

In mathematics, a *-ring is a ring with a map * : A → A that is an antiautomorphism and an involution.

More precisely, * is required to satisfy the following properties:

for all x, y in A.

This is also called an involutive ring, involutory ring, and ring with involution. Note that the third axiom is actually redundant, because the second and fourth axioms imply 1* is also a multiplicative identity, and identities are unique.

Ring (Suzuki novel)

Ring (リング, Ringu) is a Japanese mystery horror novel by Koji Suzuki, first published in 1991, and set in modern-day Japan. It was the basis for a 1995 television film (Ring: Kanzenban),a television series (Ring: The Final Chapter), a film of the same name (1998's Ring), and two remakes of the 1998 film: a South Korean version (The Ring Virus) and an American version (The Ring).

Plot synopsis

After four teenagers mysteriously die simultaneously in Tokyo, Kazuyuki Asakawa, a reporter and uncle to one of the deceased, decides to launch his own personal investigation. His search leads him to "Hakone Pacific Land", a holiday resort where the youths were last seen together exactly one week before their deaths. Once there he happens upon a mysterious unmarked videotape. Watching the tape, he witnesses a strange sequence of both abstract and realistic footage, including an image of an injured man, that ends with a warning revealing the viewer has a week to live. Giving a single means of avoiding death, the tape's explanation ends suddenly having been overwritten by an advertisement. The tape has a horrible mental effect on Asakawa, and he doesn't doubt for a second that its warning is true.

Ringtone

A ringtone or ring tone is the sound made by a telephone to indicate an incoming call or text message. Not literally a tone nor an actual (bell-like) ring any more, the term is most often used today to refer to customizable sounds used on mobile phones.

Background

A phone “rings” when its network indicates an incoming call and the phone thus alerts the recipient. For landline telephones, the call signal can be an electric current generated by the switch or exchange to which the telephone is connected, which originally drove an electric bell. For mobile phones, the network sends the phone a message indicating an incoming call. The sound the caller hears is called the ringback tone, which is not necessarily directly related.

The electromagnetic bell system is still in widespread use. The ringing signal sent to a customer's telephone is 90 volts AC at a frequency of 20 hertz in North America. In Europe it is around 60-90 volts AC at a frequency of 25 hertz. Some non-Bell Company system party lines in the US used multiple frequencies (20/30/40 Hz, 22/33/44 Hz, etc.) to allow "selective" ringing.

Keynote (presentation software)

Keynote is a presentation software application developed as a part of the iWork productivity suite by Apple Inc. Keynote 6.0 was announced on October 23, 2013 and is the most recent version for the Mac. On January 27, 2010, Apple announced a new version of Keynote for iPad with an all new touch interface.

History

Keynote began as a computer program for Apple CEO Steve Jobs to use in creating the presentations for Macworld Conference and Expo and other Apple keynote events. Prior to using Keynote, Jobs had used Concurrence, from Lighthouse Design, a similar product which ran on the NeXTSTEP and OpenStep platforms.

The program was first sold publicly as Keynote 1.0 in 2003, competing against existing presentation software, most notably Microsoft PowerPoint.

In 2005 Apple began selling Keynote 2.0 in conjunction with Pages, a new word processing and page layout application, in a software package called iWork. At the Macworld Conference & Expo 2006, Apple released iWork '06 with updated versions of Keynote 3.0 and Pages 2.0. In addition to official HD compatibility, Keynote 3 added new features, including group scaling, 3D charts, multi-column text boxes, auto bullets in any text field, image adjustments, and free form masking tools. In addition, Keynote features three-dimensional transitions, such as a rotating cube or a simple flip of the slide.

Key (singer)

Kim Ki-bum (born September 23, 1991), better known by his stage name Key, is a South Korean singer and actor. Debuted as a member of the group SHINee in May 2008, and began his acting career in 2011 in the Mnet's series Moon Night '90, playing Lee Hyun Do. In 2014 Key and Nam Woo-hyun formed the duo Toheart with duos successful debut song 'Delicious'.

Early life

Key was born in September 23, 1991 in Daegu, South Korea. He was a varsity water-skier in Dae Gu Yeong Shin Middle School. In 2006, he joined the SM Entertainment after a successful audition on SM National Tour Audition Casting. In 2007, he appeared as a background dancer in the film Super Junior, Attack on the Pin-Up Boys.

Career

Shinee

In 2008, he was chosen as a member of the group Shinee. The group released their first mini-album, Replay on May 22 debuting at #10 and reached the #8 position on the charts. The first television presentation of the group occurred in May 25, 2008 in the program SBS's Inkigayo.

Toheart

In 2014 Key formed a duo with Woohyun from Infinite. It is a collaboration between S. M. Entertainment and Woollim Entertainment. According to the members it was their idea to form a duo since they are close friends but they weren't thinking of a musical collaboration, instead thinking of photoshoots and similar.

List of Marvel Comics characters: K

Kamal

Kamal el-Alaoui is a mutant villain who first appeared in Magneto #1. Kamal was amongst those Acolytes encountered by the young clone of Magneto named Joseph in the remains of the Acolytes' orbital base Avalon in the foothills of the Andes Mountain near the Bolivian border in South America. Kamal has not been seen after Cassandra Nova's Sentinel destroyed Genosha, killing 16 million mutants. Kamal's mutant powers allows him to absorb the appearance and properties of materials he touches.

Kariooq

Kariooq, The Corruptor appears in Alpha Flight (vol. 1) #24. He resembles a giant rotting corpse with green skin, similar to the Inhumanoid named D'Compose (although the two were created around the same time period). Kariooq is never fleshed out other than his weakness to ice ("the preserver") and his enmity with Tundra as a rival. It can be assumed however that his power might be that of decay and corruption or even control of the dead.