book of characters

''the weird studies of harley warren were well known to me, ... of his vast collection of strange rare books on forbidden subjects i have read all that are written in the languages of which i am master; but these are few as compared with those in languages i cannot understand ... and the fiend inspired book which he carried in his pocket out of the world---the book which warren carried with him---that ancient book ... was written in characters whose like i never saw elsewhere.'' 

h.p.lovecraft, the statement of randolph carter.