Quotes:Theli
H. P. Blavatsky
Theli. The great Dragon said to environ the universe symbolically. In Hebrew letters it is TLI= 400+30+10 = 440 when “its crest [letter] is repressed”, said the Rabbis, 40 remains, or the equivalent of Mem; M=Water, the waters above the firmament. Evidently the same idea as symbolised by Shesha — the Serpent of Vishnu.
Source: H. P. Blavatsky, The Theosophical Glossary, art. Theli