The post (10) over its complete height has a constant, virtually triangular outer contour, the corners of which are rounded or inclined. It has an upper head section (12), on which is fixed a downwardly connecting reflector section (16). Abutting on the reflector section is a distance section (18) reaching as far as the lower end of the post. The head section of the post is provided with a tubular holder (24) which is formed for releasable insertion of the lower end of a vertical marking rod (27). The tubular holder has a base as a stop for the lower end of the marking rod, and the holder, laterally to the post, extends over the complete length of the head section of the post.
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