Numbered musical notation and so on. Dashes after a note lengthen it, each dash by the length of a quarter note. A dot after the plain or underlined note works increases its length by half, and two dots by three quarters. The underline, along with its joining, are analogous to the number of flags and beaming in standard notation. So are dotted notes. But the analogue stops at notes worth three quarter notes and beyond, where dashes are used instead. The number "0" represents the musical rest. The rules for length is similar to that of the note, except that it is customary
Musical notation steps to add. The direction of the bracket, opening or closing, determines whether to add or subtract scale steps. As a result of the mathematical nature of pitch bracket notation, arithmetic and algebra can be directly applied to the notation. Musical variations can be mathematically generated from their themes. Cipher notation systems assigning Arabic numerals to the major scale degrees have been used at least since the Iberian organ tablatures of the 16th-century and include such exotic adaptations as "Siffernotskrift". The one most widely in use today is the Chinese "Jianpu", discussed in the main article. Numerals can of course