The term 'MUSICAL 'repeat' mark' is referring to the MUSICAL notation symbol known as a segno, which is represented by the letters S-E-G-N-O. A segno is a sign that indicates to the musician to repeat a certain section of music. It is usually placed at the beginning of the section that is to be repeated and is followed by a corresponding sign, such as a coda, which indicates the end of the repeated section.