Hash

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

Substances

• Hash (food), a coarse mixture of ingredients
• Hashish, a cannabis product

Organizations

• Hash House Harriers, a running club

Hash mark

• Hash marks, a marking on hockey rinks and gridiron football fields
• Hatch mark, a form of mathematical notation
• Service stripe, a military decoration
• Tally mark, a counting notation

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