Someone please tell me what the numbers mean - 525 and stuff

So what do they all mean?? Like 317, 525 and stuff! :S

 

317 - Old runeScape graphics, Like when there was old PKing and no trade limits

525 - New RuneScape Graphics.

562 - Like HD and stuff, Even more detailed.

 

They are the different updates of runescape. Each time a major update occured, the number rose. This was mostly graphics and additional items, skills, etc. I'm sure there's a list somewhere.