I think I learned this a while back but I can't seem to remember. On a drumstick, what does the number and the letter stand for? Like a 5A stick - Is 5 for the length and A for the girth? Anyone?
Scroll down a bit for an explanation. Looks like these days it doesn't mean much further than identification by brand. First generation sticks used a letter and number to tell you the size and recommended application.
Sorry - I'm just repeating what's in that page, quite informative.