Small metal markers (fiducials) made out of gold for bio-compatibility and high density to give good contrast on X-ray images are surgically implanted in the patient.

It adjusts its position by using sensors to detect metal markers or guide paths buried at intervals in the lawn.

The metal marker sometimes attaches to breast tissue too far from the biopsy site to be useful as a future reference.

Examining a metal marker left at the demarcation, Sec found that, no, the Slash was neither contracting nor expanding.

But rain and time have flattened much of the earth and rusted away many of the numbers on the small metal markers.

There would be a saving, too, if we were content to use metal markers for the graves, but here, too, we subscribe to tradition.

The metal marker indicating Monge's grave has been marred with bullet holes.

The graves were marked by two metal markers, but they were diminished by natural mechanisms.

A Geodetic Survey benchmark is a metal marker about 3 1/2 inches in diameter, placed on a stable foundation like a building or bridge abutment.

That spot, at a slightly hidden metal marker in a rock, is on the side of Mount Frissell, whose summit is in Massachusetts.