User talk:198.27.160.209

Got it from a german lexicon: "Das Vieweg Einheiten-Lexikon: Begriffe, Formeln und Konstanten aus Naturwissenschaften, Technik und Medizin".

https://books.google.at/books?id=xs2fBgAAQBAJ&pg=PA289&lpg=PA289&dq=Naperian+Digit&source=bl&ots=Pl_Jpiuaok&sig=ACfU3U360XZNWUptbIRodqdEBnaoGY6VnA&hl=en&sa=X&ved=2ahUKEwj-wKvi7u_wAhVjg_0HHfFIDAEQ6AEwEnoECB4QAw#v=onepage&q=Naperian%20Digit&f=false

But may this (english) term is not used elsewhere.