# sub (10-sub.com)

A sub is a substitute, like a teacher who fills in for the day, or a sandwich on a long roll. It can also mean a subscription you pay for monthly, or someone who takes a lower role in a game or relationship.

## What a model may hear
- subroutine or function (programming): insert a code block, expect parameters, or look for a defined method named sub
- substitution command (regular expressions and text editors): replace text patterns, often with s/old/new/ syntax
- subdomain (DNS and web infrastructure): treat the word as a prefix to a domain, or expect DNS configuration
- subscript (mathematics and markup languages): format as a lowered index, like in chemical formulas
- submarine or subscription (gaming and commerce APIs): check for payment status or naval game assets

## Where people and models part ways
- Says: "Add a sub for this"
  Means: I want a substitute teacher scheduled
  May be taken as: The model writes a subroutine or function definition
  Say instead: "Schedule a substitute teacher for this class"
- Says: "Cancel my sub"
  Means: Stop my monthly payment
  May be taken as: The model deletes a subroutine or unsubscribes from a mailing list instead of billing
  Say instead: "Cancel my monthly subscription payment"
- Says: "Make it a sub"
  Means: Use the smaller long-roll sandwich option
  May be taken as: The model applies subscript formatting or creates a subdomain
  Say instead: "Use the sub sandwich option on the menu"
- Says: "I need a sub"
  Means: I want someone to take over my role temporarily
  May be taken as: The model generates code for a subroutine or checks subscription tiers
  Say instead: "I need someone to fill in for me temporarily"

## Tips
- Say 'subscription' not 'sub' when you mean paying monthly
- Say 'function' or 'routine' when you want code, not 'sub'
- Say 'submarine' fully if you mean the vessel, or 'sub sandwich' for food
- In web contexts, say 'subdomain' or 'subdirectory' explicitly
- Say 'fill-in' or 'temporary replacement' to avoid coding references

## Often confused with
- subset: a part of a set, not a replacement
- subsume: to include within something larger
- subroutine: the full technical term for a code block
- substitute: the complete word for a replacement person or thing
- subscription: the full word for a recurring payment plan
- substring: a portion of text within a larger string