marker post; signpost; guide pole
A physical post or pole used to mark a location, provide directions, or indicate a boundary. Common in outdoor settings such as trails, roads, and construction sites.
Marker posts are set up along the mountain trail so you won't get lost.
工事現場の周りに標柱を設置して、立ち入り禁止区域を示した。
They put up guide poles around the construction site to mark the off-limits area.
levelling pole; surveying rod
A graduated pole used in surveying to measure differences in elevation. Technical term used in civil engineering and land surveying.
測量士は標柱を使って地面の高さを測った。
The surveyor used a levelling pole to measure the ground height.
Compound of 標 (mark, sign) and 柱 (pillar, post). The word transparently means 'marker pillar'.