C-E : Tenor
F-A : Alto
Bb,C: Mezzosoprano
C-G : Soprano
I think “Low” and “High” should be used only as following:
LOW from D to Bb
HIGH from d to g.
That’s not very scientific but if you think that for example a Bb is not “LOW”… neither does an A nor does a G…and so on… (obviously everything in higher or lower to everything) that’s anyway the best system.
However speaking of altos tenors and sopranos is easyer and makes no misunderstandings. 
What’s your opinion? :roll:
This discussion was held recently, both here and on GC I believe. Most people agreed that Bb is the divider key.
Bb (above the tenor or low D) and up are high whisltes
Bb (below the tenor or low D) bp to the next G are low whistles
Below that Bb would be the Bass whistles. This divides each group by an octive.
Is that the right way? Dunno. Does it make sense to a lot of people, YUP. Quite simple, really.
i settle for the low G to be the smallest low whistle,
because there’s nothing smaller then a high G.
colin goldie’s pricelist explains everything else
looks like a low d, sounds like a high d = castrato 
rh!!! that??? from you?
i am shocked. 
too much halloween candy 
the sugar-rush.
thanks guys!
I just change the topic for a few seconds… (instead of making another..)
Does anybody listened to MILLISH stuff?
I don’t want to talk about their music althougt I’d like to (this time I’d submit a new thread 
) but about what kind of whistle the guy’s playing in “The Mighty Pickle”.
I know first is a Low D and then an A but, the A one, is it one of the “Soprano D - 10 hole” Goldie is making? 
I can’t believe the amazing CROMATIC work is done! 
Any guess…
I’ve been working on a Whistle Nomenclature list as well.
http://jubileeinstruments.messianic-webhosting.com/wslnomn.htm