That would be a Gable
The end of a triangular roof is called a gable edge or end.
A roof with only two sloping surfaces and gables at each end is called a gable roof.
A hipped end in roof construction is a roof end plane that is inclined, instead of having a gable end.Some roof designs can have a hip at one end, and a gable at the other end.
it is called a roof
The roof
The roof of the cavity is called the "dorsal surface."
Roof
It is what you called the planning for the roof.
A post that supports a roof is called a column.
The window in a ceiling or roof is called a Skylight.
The roof of a cave is referred to as the "ceiling" or "overhang".
Sun roof