The term 'Squiggle on a Musical Score' refers to a type of musical notation known as a 'SLUR'. A SLUR is a curved line that connects two or more notes of the same pitch, indicating that they should be played as a single phrase. Slurs are used to indicate legato playing, which is a smooth, connected sound. Slurs can also be used to indicate a change in articulation, such as a crescendo or diminuendo. The term 'REST' is a musical notation that indicates a period of silence. It is represented by a rectangular symbol with a line through it.