What is the name of the iron bar placed in the telephone pole?

In China's traditional geomantic omen, such an environment is very unlucky, and it is an external evil, that is, the so-called "evil things are the best", which will affect the health of family members, make them stressed and grumpy, and eventually lead to family disharmony. Therefore, it must be avoided. You can hang a mirror outside the bedroom window to guide geomantic omen, resolve external evils, and turn the crisis into safety.