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For tags on Wikipedia, see Wikipedia:Template messages or Special:Tags.

Tag or tagging could refer to:


  • Dog tag (military), an ID tag worn by military personnel
  • Ear tag, an ID tag worn by farm animals
  • Pet tag, an ID tag worn by pets
  • Toe tag, an ID tag worn by dead bodies in the morgue
  • A form of graffiti signature
  • QR code or mobile tag, a type of matrix barcode
  • Vehicle registration plate, a plate attached to a motor vehicle or trailer for official identification
  • Valve Tag, a rectangular piece of stainless steel metal denoting the type of application the valve is to be used in.Can be found in various chemical plants around the country.[1]


  • TAG (BBS), a bulletin board software program
  • Tag (Facebook), a link to another Facebook page
  • Tag (metadata), an index term assigned to a piece of information; a type of meta-information that captures knowledge about an information resource
  • Tag (programming), a method for passing parameters to subroutines
  • Tags (Unicode block), deprecated characters for invisibly tagging texts by language
  • HTML tag, a component of the HTML markup language
  • Revision tag, a label for a specific revision of a project
  • Tag editor, software that supports editing metadata of multimedia file formats
  • Tag files, indexes to identifiers in source code generated by ctags
  • Tag system, a deterministic computational model
  • Tag URI, a unique identifier protocol used in internet technologies

Language and education[edit]



Natural science[edit]

Government/political organizations[edit]


Other uses[edit]

See also[edit]