This T-shaped gable-and-valley roof with adjoining cross-gabled roof is a complex roof construction consisting of several roofs joined together.
In this case, several gable roofs are adjoined perpendicularly. The ridge of the left-hand gable roof and that of the main gable roof are the same height and said to be intersecting. Whereas the ridge of the right-hand gable roof is lower than that of the main gable roof, in other words non-intersecting.
Similarly, you’ll also see hip-and-valley or cross-hipped roofs with two or more hip roofs joined in the shape of a cross, a ‘T’, or an ‘L’.