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Hash, Hashes, Hash mark or Hashing may refer to:

Hash mark
In linguistics, typography
  • Hash or hash mark, the glyph #, also called number sign
In computing
  • Hash function, a derivation of data, notably seen in cryptographic hash functions
  • Hashtag, a form of metadata often used on social networking websites
  • Cryptographic hash function, a derivation of data used to authenticate message integrity
  • Hash table, a data structure
  • hash (Unix), an operating system command
  • Fragment identifier, in computer hypertext, a string of characters that refers to a subordinate resource
  • Geohash, a spatial data structure which subdivides space into buckets of grid shape
  • Hash chain, a method of producing many one-time keys from a single key or password