The logical character of I is obligatorily deictic. Some variant devices have obligatory anaphoric reference, some are free, and some again have obligatory deictic reference. It is by singling out individuals made salient in the extra-sentential context that uses of this third sort refer. Substitution instances reveal and matching constraints confirm that each use of I (together with singular You) must fall into this third category.
Keywords: deictic term, logical character, anaphora, extra-sentential context, substitution instances, matching constraints, salience, singular personal pronouns