# number (0-number.com)

A number is a word or symbol used for counting or measuring. People say "number" when they want a figure, a phone number, a house number, or a quantity of something.

## What a model may hear
- numeric data type (programming and databases): May expect an integer, float, or decimal and reject text that looks like a number
- phone number or identifier (telephony and CRM systems): May format digits with country codes, dashes, or parentheses, or flag invalid formats
- serial or index number (databases and arrays): May assume zero-based or one-based indexing, or treat it as a primary key
- mathematical object (mathematics and statistics): May perform calculations, round, or check for primality or randomness

## Where people and models part ways
- Says: "Give me a number"
  Means: Any figure, maybe random or arbitrary
  May be taken as: Returns a random integer or assumes a specific range like 1-10
  Say instead: "Give me a random whole number between 1 and 100"
- Says: "My number is 555-0199"
  Means: A phone number with dashes
  May be taken as: Parses as subtraction: 555 minus 199 equals 356
  Say instead: "My phone number is 555-0199, written with dashes"
- Says: "The number of items"
  Means: A count of things
  May be taken as: Assumes zero if no items are listed, or confuses with item index starting at zero
  Say instead: "Count how many items are in this list"
- Says: "A big number"
  Means: Something large, maybe millions or billions
  May be taken as: Returns the maximum value of a 64-bit integer or scientific notation
  Say instead: "A large number, around ten million"

## Tips
- Say 'whole number' or 'decimal' if the type matters.
- Write phone numbers with words like 'phone' nearby to keep dashes literal.
- Say 'count' instead of 'number' when you want a total of items.
- Specify the range if you want a random or example number.
- Say 'written as text' if digits should stay as characters, not values.

## Often confused with
- digit: A single symbol 0-9, not the whole value
- integer: A whole number with no fractions, more technical
- numeral: The written symbol, not the abstract quantity
- figure: Often means a shape or a person's body, or a number in finance
- amount: Used for uncountable things like water or money, not individual items
- quantity: More formal, often with units attached