bit mill (btm) not millibit - but again I don't see this as worth spending time on.  There will not ever likely be agreement on this - as long as we can all deduce what people are talking about it shouldn't much matter.  Some people (moreso in the past than now) used to call $0.25 'two bits.'  If you here that today (in USA at least) pretty much everyone knows what the person is talking about.  Stop worrying so much about the naming conventions.  If we need XBT for the ISO currency code and that is to be 0.000001btc that's fine - beyond that we'll figure it out in time