“Acoustic unicycle,” – now there’s an objectionable term if ever there was one (IMHO, and I think I’m being reasonably restrained with ‘objectionable’ 
). I mean you don’t call a bike an “acoustic bike” to differentiate it from a motor bike, it’s just a bike… a “pedal cycle” if it was some legal term or whatever, but “acoustic”?
Maybe I’ve got the wrong end of the stick though and you get unicycles that you can play tunes on – in that case, is this classed as an electric unicycle?