What does that mean? I saw it on a concrete pole and I thought it looked interesting.
Its used by a topcon or similar device. The device is used to map out 3D space using these points as Z, Y, Z distance markers from the device.
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![[OC] Survey Mark(aussie.zone)](https://aussie.zone/pictrs/image/900aec92-4a08-4e63-99ff-5807b43f1b0b.jpeg){kind=link}