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

Substances

Hash (food) Hash is a culinary dish consisting of chopped meat, potatoes, and fried onions. The name is derived from , meaning "to chop". It originated as a way to use up leftovers. In the U.S. by the 1860s, a cheap restaurant was called a "hash house" or ...

, a coarse mixture of ingredients * Hash, a nickname for hashish, a cannabis product

Hash mark

Hash mark (sports) In sports, a hash mark or hash line is a short line/ bar marking that is painted perpendicular to the sidelines or side barricades, used to help referees and players recognize on-field locations and visually measure distances. Hash marks serve ...

, a marking on hockey rinks and gridiron football fields *

Hatch mark Hatch marks (also called hash marks or tick marks) are a form of mathematical notation. They are used in three ways as: * Unit and value marks — as on a ruler or number line * Congruence notation in geometry — as on a geometric figure * Grap ...

, a form of mathematical notation *

Number sign The symbol is known variously in English-speaking regions as the number sign, hash, or pound sign. The symbol has historically been used for a wide range of purposes including the designation of an ordinal number and as a ligatured abbreviati ...

(#), also known as the hash, hash mark, or (in American English) pound sign *

Service stripe A service stripe is an embroidered diagonal stripe worn on the sleeve(s) of some military and paramilitary uniforms. In the case of the United States military, service stripes are authorized for wear by enlisted personnel on the lower part of the ...

, a military and paramilitary decoration *

Tally mark Tally marks, also called hash marks, are a unary numeral system ( arguably). They are a form of numeral used for counting. They are most useful in counting or tallying ongoing results, such as the score in a game or sport, as no intermediate r ...

, a counting notation

Computing

Hash function A hash function is any function that can be used to map data of arbitrary size to fixed-size values. The values returned by a hash function are called ''hash values'', ''hash codes'', ''digests'', or simply ''hashes''. The values are usually ...

, an encoding of data into a small, fixed size; used in hash tables and cryptography *

Hash table In computing, a hash table, also known as hash map, is a data structure that implements an associative array or dictionary. It is an abstract data type that maps keys to values. A hash table uses a hash function to compute an ''index'', ...

, a data structure using hash functions *

Cryptographic hash function A cryptographic hash function (CHF) is a hash algorithm (a map of an arbitrary binary string to a binary string with fixed size of n bits) that has special properties desirable for cryptography: * the probability of a particular n-bit output re ...

, a hash function used to authenticate message integrity *

URI fragment In computer hypertext, a URI fragment is a string of characters that refers to a resource that is subordinate to another, primary resource. The primary resource is identified by a Uniform Resource Identifier (URI), and the fragment identifier po ...

, in computer hypertext, a string of characters that refers to a subordinate resource *

Geohash Geohash is a public domain geocode system invented in 2008 by Gustavo NiemeyerEvidences at the Wayback Machine: labix.org in 2008, the G. Niemeyer's blog announcing Geohash *an article about Geohash witnessing and citing G. Niemeyer works, befor ...

, 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) hash is a command on Unix and Unix-like operating systems that prints the location information for the commands found. The command has also been ported to the IBM i IBM i (the ''i'' standing for ''integrated'') is an operating system developed ...

, an operating system command *

Hash chain A hash chain is the successive application of a cryptographic hash function to a piece of data. In computer security, a hash chain is a method to produce many one-time keys from a single key or password. For non-repudiation a hash function can ...

, a method of producing many one-time keys from a single key or password *

Password hash In cryptography, a key derivation function (KDF) is a cryptographic algorithm that derives one or more secret keys from a secret value such as a master key, a password, or a passphrase using a pseudorandom function (which typically uses a cryp ...

Zobrist hashing Zobrist hashing (also referred to as Zobrist keys or Zobrist signatures Bruce Moreland/ref>) is a hash function construction used in computer programs that play abstract board games, such as chess and Go, to implement transposition tables, a sp ...

, a method of hashing chess positions into a key *

Hashgraph Hashgraph is a distributed ledger technology that has been described as an alternative to blockchains. The hashgraph technology is currently patented, is used by the public ledger Hedera, and there is a grant to implement the patent as a result ...

, a

Distributed ledger A distributed ledger (also called a shared ledger or distributed ledger technology or DLT) is the consensus of replicated, shared, and synchronized digital data that is geographically spread (distributed) across many sites, countries, or institutio ...

technology.

Other uses

Hash House Harriers The Hash House Harriers (HHH or H3) is an international group of non-competitive running social clubs. An event organized by a club is known as a Hash or Run, or a Hash Run. A common denominal verb for this activity is Hashing, with participan ...

, a running club * ''Hash'' (EP) ('' '), a 2020 EP by Loona

Substances

Hash mark

Computing

Other uses

See also