OFFTOPIC: What is "francais hexagonal"?

I ran into this term, and was mystified: obviously "hexagonal
(six-sided?) French" is not a useful translation.

Thanks for any help.

--
John Cowan      http://www.ccil.org/~cowan              cowan@ccil.org
        You tollerday donsk?  N.  You tolkatiff scowegian?  Nn.
        You spigotty anglease?  Nnn.  You phonio saxo?  Nnnn.
                Clear all so!  'Tis a Jute.... (Finnegans Wake 16.5)