threefold
Of a mirror: having three reflective surfaces hinged together.
Any sheet of paper or cardboard, folded into three sections along two parallel creases and used to present information, typically as a brochure or display board.
Anything folded into thirds to resemble a trifold.
A wallet with three equal-sized sections that fold together.
Triple; threefold.
Denoting the aspect of two celestial bodies which are 120° apart.
To put in the aspect of a trine.
A group of three things.
An aspect of two astrological bodies when 120° apart.