The phrase "unique hinge" refers to a special and one-of-a-kind joint mechanism or connection. It describes something that stands out and is different from others in the way it moves or operates. Full definition
The case's unique hinge allows for 135 degrees of adjustment, while island - style keys let you comfortably type as if you were using a traditional keyboard. (digitaltrends.com)
The Dream On Me 2 - in - 1 Lightweight Portable Folding Baby Crib is fitted with unique hinges that can help you fold this crib flat. (babycribfinder.com)
An answer to all the bulky, overdone, rubber third - party cases made for the first iPad, Apple's unique hinged cover comes in two materials — leather ($ 59) and polyurethane ($ 39)-- and multiple colors. (cnet.com)