Strategy and product
TOM
Target obtainable market, or total obtainable market. Used by some instead of SOM, and by others for the specific slice your plan is aiming at. Definitions vary, so ask which is meant.
You'll hear it as
Our TOM for year one is the two hundred firms already on the waiting list.
Why it matters to you.
In consultancy decks, TOM usually means "target operating model", how an organisation plans to run, which is something else entirely.
Videos.
No video mentions TOM by name yet. These are on the same topic, Business & startups.