Serpens Rota (Sator arepo teNet opera rotaS). N is hebraïc Nun, ancient serpent who became the fishes . Other references for N: « In hebrew Nahash=serpent, in Latin Naïas=Naïad, in greek Naiad, nereide= mermaid, water spirit». Neck (English) or Nixe (German) are water spirits who usually appear in human form - ((N.B: In the bible Joshua is called "Jesus son of Nun" = son of the fish. (Joshua, Yehoshua,Josue, Isaiah, Yahshuah, Ihesus, Jesus, have all the same meaning: "Yah is the savior"