It is one of the diminutives of tape. The strap is also a thin strip of fabric, black or purple colors used to signify mourning, for the death of someone. In medicine. It is a fibrous tract ( 41 tendons; ranging from the buttock to the outside of the knee. Called also tract ileotibial, fascia lata or iliotibial ileotibial. This fibrous band can be injured very easily in athletes that run through uneven terrain and is quite painful.