Jack

Jack has many meanings:

General

• Jack (mechanical), a mechanical or hydraulic device used to lift (car jack).
• Jack (connector), a receptacle for electrical connections.
• Jackhammer, a pneumatic hammer.
• Jack plane, a medium sized plane (tool) for smoothing wood.
• JACK Audio Connection Kit, an open source computer sound server
• Jack traditionally refers to a sailor, as in Jack tar, or any other non-specific labourer, as in lumberjack and Jack of all trades.

Games and toys

• You Don't Know Jack, a series of trivia computer games.
• Jack (playing card), the lowest face card in a deck of playing cards.
• Jack-in-the-box, a children's toy.
• Jacks, playground game for children.
• The target ball in games such as bowls, bocce or pétanque, also know as a kitty.
• Jack-o'-lantern, the traditional symbol for Halloween.

As a verb

• Jacking, a form of dance popular in the late 1980s.
• A euphemism for masturbation (jacking off).
• A slang derived from the word hijack, meaning "to take".
• Commonly used in sports when the ball is thrown or hit a long distance, such as a home run or a three-point field goal.

Names

• Jack (name), originally a nickname for Jacob and John.
• Jack the Ripper, a Victorian era serial killer.
• Jack Robichaux, a 19th century serial rapist in New Orleans.
• The antagonist in William Golding's novel, Lord of the Flies.
• Spring Heeled Jack, a legendary figure of the Victorian era.
• A Jackeen is a mildly pejorative term for someone from Dublin, Ireland.

Films and comics

• Jack (film), a film directed by Francis Ford Coppola starring Robin Williams.
• Jack (comic), a web comic.
• Samurai Jack, an animated cartoon series produced for Cartoon Network, whose lead character is a samurai referred to as 'Jack' (true name unknown).
• Jack-in-the-Box, a fictional character from the Astro City comic book series.
• Jack Skellington, the main character from the family movie The Nightmare Before Christmas.
• Jack Sparrow, a fictional pirate from the movie Pirates of the Carribean: The Curse of the Black Pearl and its sequels.
• Jack the monkey, a fictional monkey also from the movie Pirates of the Carribean: The Curse of the Black Pearl and its sequels.
• Jack of the Tales, the legendary Jack and the Beanstalk and other stories featured in the comic Fables.

Television

• Jack Bristow, a main character from Alias.
• Jack Bauer, the main character of 24.
• Jack O'Neill, the main character of Stargate SG-1.
• Jack Shepard, the doctor on Lost.
• Jack the Front Loader, from the Thomas the Tank Engine and Friends TV series.
• Jack Black a well-known movie actor.

Radio

• Jack radio format, also known as "Adult Hits".

Brands

• Jack, the logo of Cingular Wireless.
• Jack Daniel's, a brand of whiskey.
• Jack FM, a brand for numerous radio stations in Canada and the United States.
• Jack in the Box, a chain of restaurants, and its mascot Jack.
• JACK Audio Connection Kit, a kind of audio server software.
• Jack, a device by WideRay for delivering content to mobile phones.

Flags

• A type of maritime flag flown from the bow of a ship.
• Union Jack, a common term for the Union Flag (the national flag of the United Kingdom).
• Union Jack, the flag flown by the United States Navy from the prow of their ships.

Species

• Jackfruit, Artocarpus heterophyllus, a species of tree native to the East Indies.
• Carangidae, a family of several fish species.
• "Jackass" (donkey), an animal in the horse family.
• Jackass penguin, a species of penguin.
• Jack (tree), Mangifera caesia, a relative of the mango.

Other uses

• Jack of plate, a type of armor consisting of many small plates sewn into a garment..
• Journeyman, a craftsman beyond the apprentice stage, but not yet a master.
• Jack (Tekken), a series of robots in the Tekken series.
• Jack, the main character of Square's 3-D WorldRunner and JJ.