In Java, the notes of the "slendro" scale can be designated in different ways; one common way is the use of numbers often called by their names in Javanese, especially in a shortened form. An older set uses names derived from parts of the body. Notice that both systems have the same designations for 5 and 6. There is no 4; possibly this is because it appears as an unusual tone in pelog and is not used when modulating between the systems.