Cross and swoop create an abstract speech bubble, indicating these are oral teachings. The ones with concentric swoops indicate the teachings are coming from or being heard in more than one place/in other words indicating the network. If these teachings are also broadcast (which may be part of your oral teaching) then they can also indicate that.
If you would like to see variations on any entry i submit, please ask. Happy to do.
35 has some adjustment to swoops, etc. Any of these would be able to stand alone as an emblem without the rest of the type so they have some versatility.