What is "karahafu"

The is a type of gable with a style peculiar to Japan. The characteristic shape is the undulating curve at the top. This gable is common in traditional architecture, including Japanese castles, Buddhist temples, and Shinto shrines. Roofing materials such as tile and bark may be used as coverings. The face beneath the gable may be flush with the wall below, or it may terminate on a lower roof.