Token

A token is an object of value, and may refer to:

• Token coin, a piece of metal or other composition used as a substitute for currency; includes subway tokens
• Casino token
• Other items that are part of exonumia
• Tokenism, the inclusion of a single person (or very few people) of a group so an organization can publicly claim to be inclusive
• Knight's token, carried by a medieval knight
• Wedding token, wedding paraphernalia also known as an arrhae or wedding coin
• Game piece or counter used in a game
• Book token, a (branded) voucher or gift card redeemable for books
• Token (railway signalling), a physical object given to a locomotive driver to authorize him to use a particular stretch of single railway track

Popular culture

• Token Black, the only African American child in the South Park television series
• The Tokens, vocal music group

Computing

There are two classes of meaning of 'token' in computing:

• An object which represents the (often exclusive) right to perform some operation:
  • Token (Petri Net), an object used in Petri net theory
  • Session token, a unique identifier which is generated and sent from a server to a software client to identify an interaction session and which the client usually stores as an HTTP cookie
  • Security token (also known as a hardware token, authentication token or cryptographic token), a physical device that an authorized user of computer services is given to aid in authentication
  • Access token, a system object representing the subject of access control operations
  • Token ring, a local area network technology in which a virtual object known as a token is passed between devices on the network, authorizing them to communicate
  • Invitation token, sometimes called a "code", sometimes used as a method of curbing website registration for a number of purposes

• An atomic object in parsing:
  • Token (parser), usually a word or other atomic parse element
  • Tokenizing, the operation of splitting a string of characters into a set of tokens in lexical analysis

Other

• Token (type), an instance of a type in logic, computational linguistics, and information retrieval
• Token Racing, a Formula One car racing team

See also

• All pages beginning with "Token"
• All pages with titles containing "Token"
• Toke (disambiguation)
• Tokin