You can describe a shape or an object as sharp if part of it or one end of it comes to a point or forms an angle.
尖的
Sharp is used after stating a particular time to show that something happens at exactly the time stated.
(…点) 整 • She arrived at ten sharp.
Sharp is used after a letter representing a musical note to show that the note should be played or sung half a tone higher. Sharp is often represented by the symbol ♯.
升半音