I saw this posted elsewhere: ca-pub-xxxxxxxxxxxxxxxx refers to your AdSense for content ad units pub-xxxxxxxxxxxxxxxx is the way in which the number appears when generated in ad code xxxxxxxxxxxxxxxx would be the 16-digit form of the number Is this agreed among members?
Yes it is. I'm a canadian publisher and I don't have CA in all of my ads.. so it isn't a country thing. (or else you'd have one for US, etc)