What do the numbers like '3004/20' mean with regard to LEGO se

[srdavis]

I've seen this number or similar in the description of instructions on lego.com

For example, the instructions for the Empire State Building 21002:

BI 3004/20-115G - 21002 - Download size: 1.49 Mb

BI 3004/20-115g - 21002 V29 - Download size: 2.57 Mb

BI 3004/20-115g-21002 V.39 - Download size: 2.53 Mb

What do these codes/numbers correspond to?

BI - Building Instructions

3004/20 - ???

115g - Model weight???

21002 - Set number

V.39 - Instructions version?

Another example is the instructions for The LEGO Movie: Castle Cavalry 70806 (brickset)

Any help is much appreciated. Thank you in advance.

[DrJB]

it is just their internal reference number for whatever PDF document you were after. all companies do this. when you download a PDF from TLG, have you noticed that it never has the actual set number, but rather some obscure series of alphanumeric characters? not sure any outsider can know for sure where those exactly come from.

Edited January 14, 2015 by DrJB

[srdavis]

I found the answer on Stack Exchange:

BI 3005/48 - 7594 V 110 2/2 - Download size: 5.94 Mb
^   ^   ^    ^  ^	 ^			 ^
1   2   3    4  5	 6			 7

1. Stands for Building Instructions
   
2. A number for internal usage by different LEGO teams.
   
   • You'll see that many different sets share this number, and all the numbers are fairly close (generally in the early 3000's). My guess is that it has something to do with whoever drafted and finalized the instruction manual.
     

[*]This number shows the number of pages in the manual.

• When the number is show x+y, that means x building pages, and y instructional pages (e.g. what to do with bricks, or what bags are needed).
  

[*]This is the set number.

[*]This number refers to the page format of the instruction manual.

• V29 means A1 paper format.
  
• V39 means letter paper format.
  
• Other Vs (like 110, 140, etc) are different file formats. LEGO said "those are the types of versions throughout our country that we ship to". I'm guessing that they are related to the official formats for the manuals that are included with the kits.
  

[*]The booklet number: x/y means x booklet number out of y booklets.

[*]The file size of the instruction in megabytes (not megabits, as it would seem to imply).

[DrJB]

I can't help but just wonder as to how useful this piece of trivia is ... :)