Grand Trines
The Grand Trines study finds when three bodies form a grand trine, a triangular configuration in which each body trines the other two.
Stelliums
The Stelliums study finds when three bodies gather together in a tight cluster in the zodiac.
T-Squares
The T-Squares study finds when three bodies form a T-square, an opposition with a third body squaring both ends.
Yods
The Yods study finds when three bodies form a yod, sometimes called the "finger of God," a configuration that points to a single focal body.