Which term refers to a small headstone utilized to identify individual graves?

The term that refers to a small headstone utilized to identify individual graves is "marker." In the context of cemeteries, a marker is typically a stone or plaque placed at the head or foot of a grave. It serves the critical function of identifying the burial site, often displaying the name of the deceased and pertinent dates, serving both a memorial role and a practical one for locating the grave.

While terms like "flat marker" specifically describe a certain type of marker that lies flat on the ground, "marker" is a more general term that encompasses various styles and shapes used in grave identification. The other options do not specifically designate a small headstone for individual graves and thus do not fully encapsulate the essence of what a marker is in this setting.