Quote:
Originally Posted by chubbyhubby
Actually, these were non-reflective and made of either brass or stainless steel. Size-wise, they were only 1" or less in diameter and looked as if they were held in the ground with just a stud in the center. Some were round, and some were hexagonal, but all were either flush with the ground or only stuck up around 1/4". We also saw many of them in very nondescript areas, in various locations around temple walkways where there is nothing to mark out. Very puzzling to me...
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Without a picture, there are a couple of possibilities.
Depending on area, some are to mark the underground lines of water and gas pipes. By linking them you can easily find the path of the pipes. These are usually painted though, and embedded with a screw in the middle.
The more likely option from your description, however, are survey markers.
Here is a good example. They vary quite a bit though, and can be in all different shapes. In the city they are usually long metal rods with a rounded tip and an indentation on the top to mark the center (it can look like a stud). They`re used as permanent markers for surveying the land, as boundaries and landmarks can change over time.