The term GRAPH LEAD-IN refers to three different words: TELE (4 letters), PHONO (5 letters), and SEISMO (6 letters). TELE is derived from the Greek word for 'far off' and is used to describe telecommunications, such as telephone or television. PHONO is derived from the Greek word for 'SOUND' and is used to describe SOUND recording and reproduction, such as phonographs. SEISMO is derived from the Greek word for 'EARTHQUAKE' and is used to describe seismology, which is the study of earthquakes and seismic waves.