Hi. The tri-fold brochure is also known as 'tryptich'
A simple web search defines it as: --8<---------------cut here---------------start------------->8--- Promotional brochures come in many sizes and can be folded many different ways, the most common being the tri-fold brochure. This fold creates three equal sections by folding the sides over the middle. Most tri-folds bend the right side first and then the left so that when opened, the brochure reads from left to right. --8<---------------cut here---------------end--------------->8--- If Any of You have an example. It would be nice. As the other alternative is using a propietary tool for it :(. Best Regards