Full Idea
The class of indexicals have the same property as mental files, that their reference is determined relationally rather than satisfactionally.
Clarification
'Satisfaction' would involve meeting some criterion
Gist of Idea
Indexicals (like mental files) determine their reference relationally, not by satisfaction
Source
François Recanati (Mental Files [2012], 5.1)
Book Reference
Recanati,François: 'Mental Files' [OUP 2012], p.57
A Reaction
Recanati is building an account of reference through mental files. This idea may be the clearest point I have yet encountered about indexicals, showing why they are of particular interest to philosophers.