The word bug has a number of senses in English. In American English is usually used to describe very small animals (such as insects, spiders, snails, slugs, etc). (In British English the words 'creepy crawlies' are often used.) From this meaning stem many others.
1 Zoology
Bug is often used in vernacular to refer generally to any small, terrestrial arthropod, sometimes taken to include creatures like snails and slugs as well. Since such insects are often irritating and frustrating ( mosquitoes, flies and cockroaches being prime examples of such), this word has also come to refer to something which is irritating or frustrating. For instance, a person might say someone (or a problem) is "bugging" (irritating or frustrating) them.
Bug is a term used in Australia as a name for two species of edible crustaceans of the family Scyllaridae , the Moreton Bay bug (Thenus spp.) and the Balmain bug (Ibacus peronii).
Bug is also a precise scientific term that refers to insects of the orders Hemiptera and Homoptera. The term true bugs is often used to remove ambiguity.
Since it refers to small animals, the term bug is also occasionally (and inaccurately) used to refer to microscopic life forms and viruses. Somebody might refer to having caught the "pneumonia bug", for instance.
2 Technology
A further extension of the sense of 'small lifeforms' is to small surveillance devices. This can be seen as an extension of the existing meaning of something which is small and irritating (the possible presence of surveillance bugs acts as a detriment to free speech in any context). Alternatively, a bugging device could also be likened to a "fly on the wall" - another kind of bug. See bugging.
The term bug is often used in a computer context. It describes unwanted behavior of a computer program or electronic device. More specific terms are failureFailure is defined in ISO/CD 10303-226 as the lack of ability of a component, equipment, sub system, or system to perform its intended function as designed. Failure may be the result of one or many faults. See also Cascading failure Single point of failur or defectDefect can refer to: in biology, the failure of an organism to develop properly. in manufacturing, the failure of a product to conform to specification. in materials science, a crystallographic defect is a structural imperfection in a crystal. in software. See computer bugA computer bug is an error, flaw, mistake, failure, or fault in a computer program that prevents it from working correctly or produces an incorrect result. Bugs arise from mistakes and errors, made by people, in either a program's source code or its desig (including origin of the usage) or debuggingDebugging is a methodical process of finding and reducing the number of bugs in a computer program and/or a piece of electronic hardware to make it work better, or at all. The more/untidier connections there exist between various subsystems, the harder th.
In a flight instrumentMost aircraft are equipped with a standard set of flight instruments which give the pilot information about the aircraft's attitude, speed and height. Most aircraft have these eight basic flight instruments: ; Altimeter : Gives the aircraft's height (usua, a bug is a manually positioned marker or pointer which is set to remind the pilot where the needle on the instrument should be pointing. This avoids the need to hold settings in memory, allowing the pilot to simply keep the needle aligned with the bug. The term may have arisen because of the superficial similarity to the appearance of an insect.
3 Gambling
In gamblingGambling (or betting is any behaviour involving the risk of money or valuables on the outcome of a game, contest, or other event in which the outcome of that activity is partially or totally dependent upon chance. Though for many it is a form of recreatiojargon, a bug is a small holdout device that can secretly be attached at the underside of the card table for the purpose of cheating. A card cheat will use a bug to conceal extra cards under the table for further use.
In some variants of poker, the bug is a restricted wild card, which can either represent an ace or fill a gap in a straight or flush.
