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"In the context of Liber Secundus, 4T may be said to represent the Tetragrammaton. T for Tetragrammaton and 4 indicating its meaning the four lettered name, that is YHVH, Yahweh or Jehovah, the demiurge, God the father and the key of Qabalistic formulae." - The Hermetic Library Blog
Part III: The Circumference and the Hieroglyphic Monad in In Operibus Sigillo Dei Aemeth by David Richard Jones. “In the context of Liber Secundus, 4T may be said to represent the Tetragrammaton. T for Tetragrammaton and 4 indicating its meaning the four lettered name, that is הוהי, Yahweh or Jehovah, the demiurge, God the father …