"A familiar logical triplet is Term, Proposition, Argument. In order to make this a division of all signs, the first two members have to be much widened. [---] As the third member of the triplet, I sometimes use the word Delome [...], though Argument would answer well enough. It is a Sign which has the Form of tending to act upon the Interpreter through his own self-control, representing a process of change in thoughts or signs, as if to induce this change in the Interpreter." ('Prolegomena to an Apology for Pragmaticism', CP 4.538, 1906)