If you see a weapon in your dream, it symbolizes strength and victory in your life. The weapon may also reflect your confidence and power. When you are carrying a weapon in your dream while others around you are unarmed, it indicates that you are in a unique position and possess the ability to overcome obstacles. This also signifies your willingness to face the challenges in your life.
From Imam Muhammad Ibn Seerin's Dictionary of Dreams According to Islamic Inner Traditions â entry "Weapon" (page 472).
In a dream, a weapon means power and victory, or it could mean overcoming a disease. Ifone sees himself carrying a weapon while others around him are not armed in the dream, it means that he may become a leader in his community or field. If one notices people admiring his weapon in a dream, it represents their jealousy and envy toward him. If one sees himself carrying a weapon which he uses with mastery, it represents his maturity and fulfillment
of his goals. However if a sick person sees himself carrying a weapon, it may mean his death, satisfying one's religious duties, or correcting himself. If he feels fear while carrying that weapon in the dream, it means that God Almighty will cure him from his illness. If he is travelling, it means that he will return home safely. If one is stripped from his weapon in a dream, it represents his weakness. Ifone adorns himself with a weapon in a dream, it means that he will acquire knowledge to help him overcome ignorant people, or wealth to shelter him from poverty, or it could mean victory over his enemy. A weapon in a dream also represents medicine, or a wife who protects her husband's chastity and shelters him against evil, or from desiring other women. (Also see Sword)
Note: Islamic dream interpretation depends on the dreamer's circumstances and state. This is a general guide drawn directly from the source book.