What are Santiago's omens?

In Paulo Coelho's "The Alchemist," Santiago's omens are signs and symbols that guide him on his journey to discover his Personal Legend. These omens include recurring dreams about treasure hidden near the Egyptian pyramids, the advice from Melchizedek, the king of Salem, and the language of the world that communicates through nature and events. Santiago learns to recognize and interpret these omens as crucial messages that help him navigate challenges and make decisions on his quest. Ultimately, they serve as reminders of the importance of following one's dreams and listening to one's heart.