hook

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hook

1. a piece of material, usually metal, curved or bent and used to suspend, catch, hold, or pull something
2. short for fish-hook
3. 
a. a sharp bend or angle in a geological formation, esp a river
b. a sharply curved spit of land
4. Boxing a short swinging blow delivered from the side with the elbow bent
5. Cricket a shot in which the ball is hit square on the leg side with the bat held horizontally
6. Golf a shot that causes the ball to swerve sharply from right to left
7. Surfing the top of a breaking wave
8. Ice hockey the act of hooking an opposing player
9. Music a stroke added to the stem of a written or printed note to indicate time values shorter than a crotchet
10. another name for a sickle
11. a nautical word for anchor

Hook

 

in machine building, a part of load-lifting machines that suspends loads or lifting attachments on the cables or chains of hoisting mechanisms (load hook); a part of transport machines that transmits tractive forces (coupling hook, draw hook), as between a tractor and trailer. Hooks are made as single hooks or double (sister) hooks. Load hooks made of cast or unit-forged steel have load-lifting capacities of up to 75 tons; laminated load hooks made of drop-forged steel plates have load-lifting capaci-ties of more than 75 tons. Coupling hooks are usually forged or cast single hooks. The main characteristics of hooks are standardized.

hook

[hu̇k]
(computer science)
A modification of a computer program to add instructions to an existing part of the program.
(design engineering)
A piece of hard material, especially metal, formed into a curve for catching, holding, or pulling something.
(electronics)
A circuit phenomenon occurring in four-zone transistors, wherein hole or electron conduction can occur in opposite directions to produce voltage drops that encourage other types of conduction.
(geography)
The end of a spit of land that is turned toward shore. Also known as hooked spit; recurved spit.

hook

hood, 1
1. A curved or bent metal device used for attachment.
2. A bend in the end of a reinforcing bar; also see hooked bar.

HOOK

(1)
? Object Oriented Kernel. Delphia. An object-oriented extension of Delphia Prolog.

hook

(programming)
A software or hardware feature included in order to simplify later additions or changes by a user.

For example, a simple program that prints numbers might always print them in base 10, but a more flexible version would let a variable determine what base to use; setting the variable to 5 would make the program print numbers in base 5. The variable is a simple hook. An even more flexible program might examine the variable and treat a value of 16 or less as the base to use, but treat any other number as the address of a user-supplied routine for printing a number. This is a hairy but powerful hook; one can then write a routine to print numbers as Roman numerals, say, or as Hebrew characters, and plug it into the program through the hook.

Often the difference between a good program and a superb one is that the latter has useful hooks in judiciously chosen places. Both may do the original job about equally well, but the one with the hooks is much more flexible for future expansion of capabilities.

Emacs, for example, is *all* hooks.

The term "user exit" is synonymous but much more formal and less hackish.

hook

In programming, instructions that provide breakpoints for future expansion. Hooks may be changed to call some outside routine or function or may be places where additional processing is added. See also switch hook.
References in periodicals archive ?
Asarco and Grupo Mexico have become notorious for abusing workers, retirees, communities and the environment, and they should not be let off the hook for jeopardizing the health and welfare of Omaha residents.
But water board officials said Boeing is not off the hook for 49 violations from October 2004 through April 2005.
Proposition 77 ought to have those alarms ringing off the hook.
Finley's line drive through the left side of a drawn-in infield scored Jeff DaVanon with the winning run and got reliever Scot Shields off the hook.
Our phones have been ringing off the hook," says Diana Calderon, Heart's Desire CEO.
Phones were ringing off the hook before the much-anticipated eatery even opened its doors last week, said Mark Damico, managing partner for the Woodland Hills location.
If the safe harbor provisions stay in the bill, the producers of these contaminants will be off the hook for future clean up costs, forcing communities across the country to pay potentially billions of dollars to restore their water supplies," said ACWA Executive Director Steve Hall.
As long as they take that thing off the hook when I'm done catching it, I'm fine.
The ruling removes unnecessary barriers that hamper law enforcement and it closes a legal loophole that would have permitted those responsible for the planning of terrorist activities off the hook if the planned activities are stopped before they occur.