# hash (0-hash.org)

A hash is a dish of chopped meat, potatoes, and onions cooked together. People also say 'hash' when they mean a jumble or mix of things, or the '#' symbol on a phone or keyboard.

## What a model may hear
- cryptographic hash (security and blockchain): treat it as a one-way function that turns data into a fixed-length fingerprint, and may expect hex strings or verify integrity
- hash table (computer science and programming): assume a data structure that maps keys to values using a hash function for fast lookup
- hashtag (social media and text processing): look for '#' followed by a word to tag or categorize content
- fragment identifier (web URLs): read the part after '#' as a page anchor or section ID to scroll to
- hash join (databases): expect a query operation that builds a hash table to match rows between tables

## Where people and models part ways
- Says: "Make a hash of this list"
  Means: Create a jumbled or mixed version
  May be taken as: Generate a cryptographic hash or hash table from the data
  Say instead: "Shuffle or scramble the items in this list randomly"
- Says: "Hash this out"
  Means: Discuss and resolve the issue
  May be taken as: Apply a hash function to the conversation text
  Say instead: "Let's discuss this and reach an agreement"
- Says: "What's the hash?"
  Means: What's the summary or key point?
  May be taken as: Return a SHA-256 or MD5 digest string
  Say instead: "What's the main takeaway or summary?"
- Says: "Add a hash"
  Means: Include the '#' symbol
  May be taken as: Implement a hash function or create a hash table entry
  Say instead: "Include the pound sign or number sign character"

## Tips
- Say 'pound sign' or 'number sign' if you mean the '#' character
- Say 'scramble' or 'mix up' if you want randomization, not a secure hash
- Specify 'cryptographic hash' or name an algorithm like SHA-256 for security uses
- Say 'hashtag' for social media tags to avoid data structure confusion
- Use 'summary' or 'gist' when you mean a quick overview, not a digest

## Often confused with
- hashish: a cannabis resin, not a data structure
- cache: fast storage, not a function of data
- checksum: error detection, usually simpler than cryptographic hash
- encrypt: reversible, unlike one-way hash
- index: ordered lookup, hash is unordered
- tag: label for organization, not a mathematical function