Notch in a bow is a term used to describe the indentation in the center of a bow tie. It is created by folding the two sides of the bow together and securing them with a knot. The term 'NOTCH' is derived from the Old English word 'cnotta, ' which means 'a small cut or indentation.' The NOTCH in a bow tie is an important part of the design, as it helps to keep the bow in place and gives it a more finished look.