| A | B |
|---|
| -A | stowage spaces (refrigeration, stores, issue rooms) |
| -C | vital ship and fire control (normally manned) |
| -E | machinery spaces (normally manned) |
| -F | diesel, fuel, and lube oil compartments |
| -J | JP-5 compartment |
| -K | chemical stowage spaces |
| -L | quarters, pharmacy, passageways |
| -M | ammunition spaces |
| -Q | all other spaces not normally manned around the clock |
| -T | vertical access trunks |
| -V | void compartments |
| -W | water storage compartments |
| 2, 4, 6, 8 and other even numbers | portside numbers |
| 1, 3, 5, 7 and other odd numbers | starboard numbers |
| 0 | used for the centerline |
| American ship frame numbers | start with number 1 at the bow (front) |
| European ship frame numbers | start with number 1 at the aft (rear) |
| A, B, C, and other letters | used to label the decks and levels below the main deck |
| 01, 02, 03 and other numbers | used to label the decks and levels above the main deck |
| platform | a partial deck that doesn't cover the entire length of the ship |
