(Jer. 25:26), supposed to be equivalent to Babel (Babylon), according to a secret (cabalistic) mode of writing among the Jews of unknown antiquity, which consisted in substituting the last letter of the Hebrew alphabet for the first, the last but one for the second, and so on. Thus the letters sh, sh, ch become b, b, l, i.e., Babel. This is supposed to be confirmed by a reference to Jer. 51:41, where Sheshach and Babylon are in parallel clauses. There seems to be no reason to doubt that Babylon is here intended by this name. (See Streane’s Jeremiah, l.c.)
Sheshach
2 verses
Jeremiah
Jeremiah 25:26
And all the kings of the north, far and near, one with another, and all the kingdoms of the world, which are upon the face of the earth: and the king of Sheshach shall drink after them.
Jeremiah 51:41
How is Sheshach taken! and how is the praise of the whole earth surprised! how is Babylon become an astonishment among the nations!
From Easton's Bible Dictionary
Matthew George Easton, 1897