This ranking shows how hard it is to get a flag of a certain Hattrick country on your club page, by chartering a friendly in that country. The rationale behind the coolness rating is, that it is cool to have a flag that is hard to get! For instance, pretty much anyone who would want to get a Swedish flag could get it, even in the first weeks of the cup; however, it could take the most dedicated flaghunter many seasons to conquer flags from countries like Mongolia, Suriname or Armenia. Because of the low number of active teams in those leagues, they are the hardest to get a flag from. This is reflected in the coolness rating; it is calculated as the global number of active teams (363617) divided by the respective leagues' active teams. This means that the less active teams a league has, the higher the coolness ratio becomes!
The 'ND' column shows the minimum number of divisions needed, if no ownerless teams existed in the higher divisions. If the number is higher than the actual number of divisions, then the league is due for expansion; if the number is lower, then it may have been expanded prematurely.