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Text of the page (random words):
upload file special pages search search appearance donate create account log in personal tools donate create account log in contents move to sidebar hide top 1 metadata 2 in computer science toggle in computer science subsection 2 1 in computer languages 3 ambiguity toggle ambiguity subsection 3 1 identifiers ids versus unique identifiers uids 3 2 implicit context and namespace conflicts 3 3 name vs identifier 4 identifiers in various disciplines 5 see also 6 notes 7 references 8 external links toggle the table of contents identifier 34 languages العربية azərbaycanca беларуская català čeština deutsch español suomi français galego हिन्दी ido italiano 日本語 qaraqalpaqsha қазақша 한국어 кыргызча nederlands norsk bokmål polski português română русский simple english српски srpski kiswahili தமிழ் українська اردو oʻzbekcha ўзбекча tiếng việt 粵語 中文 edit links article talk english read edit view history tools tools move to sidebar hide actions read edit view history general what links here related changes upload file permanent link page information cite this page get shortened url switch to legacy parser print export download as pdf printable version in other projects wikimedia commons wikidata item appearance move to sidebar hide from wikipedia the free encyclopedia name that identifies a specific entity registration plates are used to display identifiers for motor vehicles this article includes a list of references related reading or external links but its sources remain unclear because it lacks inline citations please help improve this article by introducing more precise citations july 2026 learn how and when to remove this message an identifier is a name that identifies that is labels the identity of either a unique class of objects or a unique instance of such objects the class or instance may be an idea person physical countable object or class thereof or physical noncountable substance or class thereof the abbreviation id may refer to identity identification the process of identifying or an identifier that is an instance of identification an identifier may be a word number letter symbol or any combination of those if the identifier follows an encoding system wherein parts of the identifier stand for represent ideas or longer names it is often referred to as a code or id code a identifiers that do not follow any encoding scheme are often said to be arbitrary ids as they have no greater meaning b a unique identifier uid is an identifier that refers to only one instance only one particular object in the universe a part number is an identifier but it is not a unique identifier for that a serial number would be needed to identify each instance of the part design for example the identifier model t identifies the class or model of automobiles that ford s model t comprises whereas the unique identifier model t serial number 159 862 identifies one specific member of that class that is one particular model t car owned by one specific person metadata edit in metadata an identifier is a language independent label sign or token that uniquely identifies an object within an identification scheme the suffix identifier is also used as a representation term when naming a data element id codes may inherently carry metadata along with them for example if a food package has the identifier 2011 09 25t15 42z mfr5 p02 243 45 you not only have that data you also have if you are aware of how that data encodes its information the metadata that tells you that it was packaged on september 25 2011 at 3 42pm utc manufactured by licensed vendor number 5 at the peoria il usa plant in building 2 and was the 243rd package off the line in that shift and was inspected by inspector number 45 citation needed arbitrary identifiers might lack metadata for example if a food package just says 100054678214 its id may not tell anything except identity no date manufacturer name production sequence rank or inspector number in some cases arbitrary identifiers such as sequential serial numbers leak information i e the german tank problem opaque identifiers identifiers designed to avoid leaking even that small amount of information include really opaque pointers and version 4 uuids citation needed in computer science edit in computer science identifiers ids are lexical tokens that name entities identifiers are used extensively in virtually all information processing systems identifying entities makes it possible to refer to them which is essential for any kind of symbolic processing in computer languages edit main article identifier computer languages in computer languages identifiers are tokens also called symbols which name language entities some of the kinds of entities an identifier might denote include variables types labels subroutines and packages ambiguity edit identifiers ids versus unique identifiers uids edit main article unique identifier a resource may carry multiple identifiers typical examples are one person with multiple names nicknames and forms of address titles salutations for example one specific person may be identified by all of the following identifiers jane smith jane elizabeth meredith smith jane e m smith jane e smith janie smith janie little janie as opposed to her mother or sister or cousin big janie aunt jane auntie janie mom grandmom nana kelly s mother billy s grandmother ms smith dr smith jane e smith phd and fuzzy her jocular nickname at work one document with multiple versions 1 one substance with multiple names for example cas index names versus iupac names 2 inn generic drug names versus usan generic drug names versus brand names the inverse is also possible where multiple resources are represented with the same identifier discussed below implicit context and namespace conflicts edit see also naming collision many codes and nomenclatural systems originate within a small namespace over the years some of them bleed into larger namespaces as people interact in ways they formerly had not e g cross border trade scientific collaboration military alliance and general cultural interconnection or assimilation when such dissemination happens the limitations of the original naming convention which had formerly been latent and moot become painfully apparent often necessitating retronymy synonymity translation transcoding and so on such limitations generally accompany the shift away from the original context to the broader one typically the system shows implicit context context was formerly assumed and narrow lack of capacity e g low number of possible ids reflecting the outmoded narrow context lack of extensibility no features defined and reserved against future needs and lack of specificity and disambiguating capability related to the context shift where longstanding uniqueness encounters novel nonuniqueness within computer science this problem is called naming collision the story of the origination and expansion of the coden system provides a good case example in a recent decades technical nomenclature context the capitalization variations seen with specific designators reveals an instance of this problem occurring in natural languages where the proper noun common noun distinction and its complications must be dealt with a universe in which every object had a uid would not need any namespaces which is to say that it would constitute one gigantic namespace but human minds could never keep track of or semantically interrelate so many uids name vs identifier edit the concepts of name and identifier are denotatively equal and the terms are thus denotatively synonymous but they are not always connotatively synonymous because code names and id numbers are often connotatively distinguished from names in the sense of traditional natural language naming for example both jamie zawinski and netscape employee number 20 are identifiers for the same specific human being but normal english language connotation may consider jamie zawinski a name and not an identifier whereas it considers netscape employee number 20 an identifier but not a name this is an emic indistinction rather than an etic one identifiers in various disciplines edit main page category identifiers identifier scope atomic number corresponding one to one with element name international via isv australian business number australian cage code u s and nato cas registry number originated in u s today international via isv coden originated in u s today international digital object identifier doi doi handle system namespace international scope din standard number originated in germany today international e number originated in e u may be seen internationally ec number employer identification number ein u s electronic identifier serial publicaction eisp international global trade item number international group identifier many scopes e g specific computer systems international chemical identifier international international standard book number isbn isbn is part of the ean namespace international scope international ebook identifier number iein international international standard serial number issn international iso standard number e g iso 8601 international library of congress control number u s with some international bibliographic usefulness personal identification number denmark denmark pharmaceutical code many different systems product batch number serial item and contribution identifier u s with some international bibliographic usefulness serial number many scopes e g company specific government specific service batch number social security number u s tax file number australian unique article identifier uai international see also edit barcode binomial nomenclature british approved name data descriptor data element descriptor diagnosis code document management system file descriptor food labeling regulations gene nomenclature handle computing identification identity object oriented programming identity document index term metadata name binding namespace naming convention programming national identification number nomenclature contains various standardized naming systems nomenclature code chemical nomenclature international code of nomenclature for algae fungi and plants international code of nomenclature of bacteria international code of nomenclature for cultivated plants international code of zoological nomenclature overloading part number persistent identifier personally identifiable information product code reference computer science referent representation term systematized nomenclature of medicine uniform resource identifier uri unique identifier unique key notes edit for instance the iso iec 11179 metadata registry standard defines a code as system of valid symbols that substitute for longer values in contrast to identifiers without symbolic meaning sometimes identifiers are called codes even when they are actually arbitrary whether because the speaker believes that they have deeper meaning or simply because they are speaking casually and imprecisely references edit university of glasgow procedure for applying identifiers to documents archived from the original on 5 june 2011 retrieved 28 april 2009 university of pennsylvania information on chemical nomenclature archived from the original on 4 january 2009 retrieved 28 april 2009 external links edit the dictionary definition of identifier at wiktionary media related to identifiers at wikimedia commons v t e personal names and anthroponymy personal name birth name given name surname patrilineal matrilineal affixes nobiliary particle by sequence given name list middle name surname list double barrelled by trait diminutive epithet animal common plant eponymic matronymic metonymic mononymic occupational patronymic surname sobriquet teknonymic toponymic surname patrial unisex virtue by life situation aptronym bardic name birth name code name maiden and married names necronym posthumous name temple name placeholder name notname regnal name slave name pseudonyms list art name bugō nicknames list hypocorism list of monarchs nom de guerre pen name heteronym ring name shikona stage name list list of mononyms username by culture east asia sinosphere chinese art courtesy generation titles hong kong formosan japanese amami okinawan korean vietnamese northern asia and central asia kalmyk manchu mongolian sakha tatar tibetan sherpa west asia middle east and north africa afghan arabic azerbaijani berber coptic hebrew mandaean pashtun persian turkish oceania australian aboriginal fijian hawaiian māori vanuatuan sub saharan africa ashanti congolese eritrean and ethiopian ewe ghanaian igbo rwandan yoruba zimbabwean europe americas and australasia western world baltic latvian lithuanian celtic cornish irish manx scottish welsh germanic dutch english american african american canadian german gothic icelandic scandinavian swedish romance french italian occitan portuguese roman praenomen nomen cognomen agnomen romanian spanish hispanic america catalan slavic bulgarian croatian czech east slavic belarusian russian ukrainian kashubian macedonian polish serbian slovak suffixes uralic estonian finnish hungarian other albanian armenian basque georgian greek ancient cypriot south asia and southeast asia indosphere balinese bengali bhutanese burmese filipino indonesian chinese javanese cambodian malaysian mizo lushai indian lao pakistani sindhi sinhalese tamilian thai by religion christian biblical papal russian orthodox clergy saint buddhist surname dharma jewish hebrew surname mandaean theophoric manners of address of authority and of honour styles honorific diplomatic imperial royal and noble judiciary religious ecclesiastical pre nominal letters suffix emeritus post nominal letters academic orders decorations and medals titles academic imperial royal and noble chivalric courtesy false hereditary subsidiary substantive military professional academic educational honorary corporate diplomatic judicial religious ecclesiastical papal related traditions baptism name day calendar of saints related acronym anonymity anthropomorphism personification national call sign deadnaming endonym and exonym family galton watson process legal name name change namesake naming taboo nomenclature nomen nescio misnomer onomastics onym personal identity identifier proper noun signature monogram royal cypher khelrtva signum manus tughra surnames by country authority control databases yale lux retrieved from https en wikipedia org w index php title identifier oldid 1365895877 categories identifiers metadata hidden categories articles with short description short description is different from wikidata articles lacking in text citations from july 2026 all articles lacking in text citations all articles with unsourced statements articles with unsourced statements from july 2026 commons category link is on wikidata this page was last edited on 25 july 2026 at 01 48 utc page was rendered with parsoid text is available under the creative commons 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