Holding only a spear signifies marriage for an unmarried person, children for a married person, and much goodness. Holding a spear together with another weapon signifies high rank.
Ja'far al-Sadiq interprets the spear through proof or evidence, authority, office, long life, victory, leadership, and benefit. Receiving a spear from a ruler or high official signifies goodness, benefit, and safety from what one fears.