Sizes are given in decimters; therefore, 2.5m diameter is given as 25. 10m is given as A0, which is 100 in hexadecimal. Radial mounts are given a "diameter" of R.
Typical sizes thus are given as 03, 06, 12, 18, 25, 37, 50, 75, A0.
Parts intended for use in airplanes are sometimes denoted as Mk0, Mk1, Mk2, or Mk3.
Kerbodyne S3 is 37, Kerbodyne S4 is 50.
If an item is two different sizes at the two ends, typically both sizes are given, e.g. 12-25. If an adapter has several mounting plates on one end, the count of these plates is also provided; e.g. 37-25x4.
For volumes and ranges, a prefix of k means that the given number is in thousands, and a prefix of m means the given number is in millions.
For commonly-provided parts (such as fuel tanks), often an abbreviation for the source mod will be added after the part title, in parenthesis; e.g. (RS+).
(Selected) designations thus used:
- FTP -- Fuel Tanks Plus
- Kerbonov
- N-Series -- Near Future Launch Vehicles
- Orion -- Stockish Project Orion
- SpaceY
- SR -- USI Sounding Rockets
- SSR -- MicroSat
- RLA -- RLA Reborn
- RS+ -- ReStock Plus
RC is used as a prefix for probe cores.
Engines have yet to be thoroughly standardized and thus still use a variety of naming conventions.
If in doubt, you can use the LV ("Liquid Vector") for liquid fuel + oxidizer engines, O (the letter after N, rather than the number) for monopropellant engines, and J for jet engines.
The exception is solid rocket boosters, that are named "SRB-diameter-fuel amount.
Tanks are named "prefix-diameter-volume 'nice' name".
(Selected) prefixes used:
- FL ("Fuel Level") -- regular liquid fuel + oxidizer tanks
- FS -- single-ended liquid fuel + oxidizer tanks
- FV -- adapter liquid fuel + oxidizer tanks; i.e. tanks that have different
diameters top and bottom
- OL -- for monopropellant tanks
- Ar -- for Argon tanks
- Li -- for Lithium tanks
- Xe -- for Xenon tanks
- UH -- Holding tanks (for Ore)
- NL ("Nuclear Liquid") -- liquid fuel only tanks, for use with Nuclear engines
- YD -- Hydrogen Tanks