Source: The Great Interpretation of Dreams (Ibn Sirin)
A seal in a dream is a position of power and rank. Whoever sees himself sealing something is completing a matter. A seal of gold indicates a position with worry.
Source: Perfuming Humanity in the Expression of Dreams (Al-Nabulsi)
A seal indicates marriage for the single. Sealing a message indicates achieving one's goal.
Source: Signs in the Science of Expressions (Ibn Shaheen)
A seal is interpreted as goodness. Whoever sees himself sealing will attain goodness and rank.