A signpost.
Anything that provides guidance; a guideline.
An outward sign; an indication.
A mark on the body corresponding to one of the wounds of the Crucifixion on Jesus' body, and sometimes reported to bleed periodically.
A mark of infamy or disgrace.
A scar or birthmark.
A visible sign or characteristic of a disease.
A ligature of the Greek letters sigma and tau, (Ϛ/ϛ).
The sticky part of a flower that receives pollen during pollination.