seinen

is a subset of manga that is generally targeted at an 18–30 year old male audience, but the audience can be much older with some comics aimed at businessmen well into their 40s. It has a wide variety of art styles and more variation in subject matter, ranging from the  avant-garde to the pornographic. The female equivalent to seinen manga is josei manga. The genre is comparable to the English terms and genre "adult" (or "mature audiences").
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v. signal, cable, message, honk

n. signal