These columns (porch posts) were popular in the US in the 18th and 19th century. The chamfered edges terminate in a “lambs tongue”.
By the way, a chamfer is a beveled edge connecting two surfaces. If the surfaces are at right angles, the chamfer will typically be symmetrical at 45 degrees (def. from wikipedia).
You can see the lamb’s tongue in the still image at the end of the video.
The chamfer and lamb’s tongue were not only commonly used on porch post but also on exposed beams.

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