Hash

A mathematical algorithm that represents a unique value for a given set of data, similar to a digital fingerprint. Common hash algorithms include MD5 and SHA.

an algorithm that creates a value to verify duplicate electronic documents. A hash value serves as a digital thumbprint.

An algorithm that creates a value to verify duplicate electronic documents. A hash mark serves as a digital thumbprint.

An unordered association of "key"/"value" pairs, stored such that you can easily use a string "key" to look up its associated data "value". This glossary is like a hash, where the word to be defined is the key, and the definition is the value. A hash is also sometimes septisyllabically called an "associative array", which is a pretty good reason for simply calling it a "hash" instead.