Hash

Hash, hashes, hash mark, or hashing may refer to:

Substances

 * Hash (food), a coarse mixture of ingredients, often based on minced meat
 * Hash (stew), a pork and onion-based gravy found in South Carolina
 * Hash, a nickname for hashish, a cannabis product

Hash mark

 * Hash mark (sports), a marking on hockey rinks and gridiron football fields
 * Hatch mark, a form of mathematical notation
 * Number sign (#), also known as the hash, hash mark, or (in American English) pound sign
 * Service stripe, a military and paramilitary decoration
 * Tally mark, a counting notation
 * Checkmate symbol in chess

Computing

 * Hash function, an encoding of data into a small, fixed size; used in hash tables and cryptography
 * Hash table, a data structure using hash functions
 * Cryptographic hash function, a hash function used to authenticate message integrity
 * URI fragment, 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
 * Hashtag, a form of metadata often used on social networking websites
 * hash (Unix), an operating system command
 * Hash chain, a method of producing many one-time keys from a single key or password
 * Password hash
 * Zobrist hashing, a method of hashing chess positions into a key
 * Hashgraph, a Distributed ledger technology.

Other uses

 * Hash House Harriers, a running club
 * Hash (EP) ([#]), a 2020 EP by Loona