The term 'horizontally ribbed fabric' is often used to describe a type of fabric that has a distinct pattern of horizontal ribs or ridges. This type of fabric is usually made from cotton, wool, or synthetic fibers and is commonly used for clothing, upholstery, and other textile products. The abbreviation 'REP' is an acronym for the word 'repeats, ' which refers to the number of times the ribbing pattern is repeated in the fabric.