Yon Thing' is a term used to refer to something THAT is distant or far away. It is derived from the Middle English word 'YON, ' which means 'THAT' or 'YONDER.' The term is often used in literature and poetry to describe something THAT is far away or out of reach. It can also be used to describe something THAT is difficult to understand or comprehend. In this context, it can be used to describe a situation or concept THAT is difficult to grasp or comprehend.