Albert Mackey,
The Symbolism of Freemasonry — Chapter XXIV
(1882)
“ Another important symbol is the Ineffable Name, with which the series of ritualistic symbols will be concluded.The Tetragrammaton, [1] or Ineffable Word,--the Incommunicable Name,--is a symbol--for rightly-considered it is nothing more than a symbol--that has more than any other (except, perhaps, the symbols connected with sun-worship) , pervaded the rites of antiquity. I know, indeed, of no system of ancient initiation in which it has not some prominent form and place. ”
