In my personal practice (personal meaning it is what I do and you do not have to believe it so keep the nasty thoughts in your heads, readers), I recognize what I call the daytime and nighttime elements.
The daytime elements are the normal ones: Earth, Air, Fire, Water, and Spirit.
The nighttime elements are: Sound, Time, Vapor, Electricity, and Shadow.
I recognize the nighttime elements as a smaller inverted pentagram overlaying the traditional pentagram creating a decagram, ten pointed star. All ten elements are involved in my rituals.