Star post
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A star post is used in making fences. In cross-section it forms a three-pointed star, perhaps 4 cm in diameter. One end is pointed so the steel post can be more easily hammered into the ground, and the other end is flat to suit the hammer. Holes are pre-drilled along the length of the post to allow wire fencing (especially barbed wire) to be attached.
Star posts are typically dipped in tar to prevent rust.
In Australia, these items are usually called "star pickets". To hammer them into the ground, one uses a section of pipe, closed at one end, which is put over the picket like a sleeve. This is far more convenient than swinging a hammer. You can purchase these ready-made, weighted and with handles, at any store selling rural supplies.
In the United States, there is a similar post called a "T" post.