According to the search results, jinns are supernatural entities that are believed to possess great powers and a mysterious existence. They are said to be afraid of iron, and iron nails are used in various protective rituals to keep them away. Salt circles are also believed to prevent jinns from crossing over into our realm. However, it is important to note that jinns are created out of fire and may wear iron as adornment or use it as a weapon themselves.

Jinns are said to fear humans, particularly people with strong faith in Allah. It is believed that humans are more honorable than jinns, and the jinn feel inferior in front of people. Ibn Abî al-Dunyâ related that Mujâhid said: “They (the Jinn) fear you as you fear them. But they fear you more than you fear them. If someone is approached by one of the Jinn, he should not fear him. Otherwise, they will pounce on him. But, if he confronts them, they will flee” .

It is also believed that jinns cannot hurt someone who wears something with the name of God written upon it. In order to get rid of fear of jinns, one can recite the name of Allah and the speech of Allah.

In conclusion, jinns are believed to be afraid of iron and salt circles, and they fear humans with strong faith in Allah. It is important to note that jinns are supernatural entities, and their existence and fears are based on cultural and folkloric traditions.