Buoys, e.g.

Usage examples of markers.

The map consisted of a series of carefully concealed symbolic markers placed in public locations around the city.

A puzzle, constructed in such a way that only certain people would have the ability to track the markers and figure out where the Illuminati church was hidden.

If these markers were in public locations, certainly there existed members of the Vatican who could have figured it out.

Illuminati had was that after they placed the markers, they needed some way to tell the scientific community the path existed.

Elements of science, the four Illuminati markers disguised as religious sculpture.

The first two markers had been located on or near piazzas that contained obelisks!

Langdon thought, still amazed by the arrangement of the markers across Rome.

Admittedly, the Roman calendar does not mesh perfectly with astrological markers, so there is some gray area in the prediction.

Paris, Langdon had learned years ago, were adorned with 135 of these bronze markers, embedded in sidewalks, courtyards, and streets, on a north-south axis across the city.

Huge piles of golden coins and silver markers were heaped on top of one another to create a single pyramid that stretched impossibly high into the sky.

He pointed ahead to a shady area where a dozen matching markers rose from the earth.

Sulu nor anyone else was prepared for the sight of hundreds of bodies piled between the fifty-meter markers and the barricades.