I dont know, I think numbers tend to get confused alot and mixed up more than a name. Sometimes people cant figure out what the numbers stand for, or the one number stands for something that more than one model has, and then you have to go adding even more numbers. Its a valid point though... just keep in mind that in the EU, many refer to their 100g-300g reefs as micro or mini reefs, and nano is pretty much anything under 100g it seems. What we call nano might be a pico to them. Not that they are used to larger reefs even... they just use different names for different sizes. Our 'Large Tank' Forum might be called 'mini-reef' forum over there...lol... because compared to nature, it is pretty tiny. So their 'nano' is named pretty correctly when you consider it all. If there was a 12" tall, 2" neck, 4" base cone skimmer with 200lph of air for what we consider 'nanos', it would most likely end up as a 'pico'.
... 12" tall, 2"neck, 4" base cone skimmer with a 200lph pump (what, an eheim 1048?)... lol... that would be cute. Too bad most nano users end up using nano cubes or HOB models... that would be cool otherwise... prolly handle up to a 40g.
Perhaps a letter designation would be best... like Mercedes... or a number that doesnt mean anything... but then again... things get confusing with arbitrary numbers like this. The 'A' class, or 'B' class... its crazy.
Anton uses numbers on his other skimmers... like the D150, D200, or 400... think its based on the diameter like H&S and ATI, and BK's do it. Only the cones cant go by that due to their shape. Or should the number be related to the maximum tank rating... or reasonable tank rating? The nano would be the 100, the Small be the 200, and the Medium be the the 400... and on? Ill agree, if there ends up being some mid-models, like one between the Small and the Medium (1000lph), this could be a problem... what then... 'Medium Small?'...lol.