What is a stellium in astrology?

A stellium is a cluster of three or more planets in the same sign or house. This concentration amplifies that sign's or house's themes in your life. For example, a stellium in the 10th house might indicate a strong career focus, while a Leo stellium emphasizes creative self-expression. Stelliums can indicate areas of great talent and focus, but also potential imbalance if other life areas are neglected.