Forehead Made of Iron
Scholars have said that seeing a forehead made of iron, copper, or stone is considered auspicious for certain groups, such as police or common people and those living hand-to-mouth. For others, however, this dream might make them disliked by people. The eyebrows also symbolize a man's good religious practice and prestige.
Per Ibn Sirin's Muntakhab al-Kalam fi Tafsir al-Ahlam
Note: These are traditional scholarly interpretations (ijtihad) drawn from a specific classical source — not a binding religious ruling, fortune-telling, or a prediction of the future.