What's the difference between i.e. and e.g.?
c.1600, from French vestige "a mark, trace, sign," from Latin vestigium "footprint, trace," of unknown origin.
vestige ves·tige (věs'tĭj)
A rudimentary or degenerate, usually nonfunctioning, structure that is the remnant of an organ or a part that was fully developed or functioning in a preceding generation or an earlier stage of development.