There is a class of hashes known as locality-sensitive hashes, which are designed to preserve some metric of "closeness". https://en.wikipedia.org/wiki/Localit

There is a class of hashes known as locality-sensitive hashes, which are designed to preserve some metric of "closeness". https://en.wikipedia.org/wiki/Locality-sensitive_hashing https://en.wikipedia.org/wiki/Locality-sensitive_hashing