The Coal
Scholars have said that seeing coal being sold out in its market may indicate people who have become poor due to the ruler, and their wealth will be returned to them.
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.