Some info outdated, but lots not outdated. Some also for JDM or world markets.

 

https://www.fanatikbaits.com/blogs/blog/everything-you-need-to-know-about-shimano-reels

 

https://www.fanatikbaits.com/blogs/blog/everything-you-need-to-know-about-daiwa-reels

 

   jj

There are some new abbreviations coming up as well, like Scorpion MD(monster drive), or Daiwa BG MQ(monocoque).  What confuses me more is the number behind the reel size number, like Daiwa Exist 2004/2506/...  Here's an explanation from TT:

 

"It's important to note that the 2004 sized Daiwa spinning reels are intended to house approximately 100 meters of 4 pound test line, hence the "4" in 2004. Similarly, their 2506 spinning reels have spools that are sized for 100 meters of 6 pound test line. Move up to the 2508 or 3012 reels, and the capacities jump to 150 meters of 8 and 12 pound test line respectively. These specified capacities will, of course, vary with each lines' actual diameter. Otherwise, the actual physical size of a Daiwa 2004 spinning reel is the same as that of their standard 2000 series reels. Likewise, the 2506/08 and 3012 reels are sized the same as their 2500 and 3000 series reels respectively."

Shimano Yumeya aftermarket spinning spools are marked for capacity. 

a 1520 spool is PE#1.5, 200 m 

an F6 spool is 6-lb fluorocarbon, 100 m.