What is the "Shamisen Bunka-Fu"

Three lines indicate the three strings on the shamisen instrument.
Simply touch the position numbers (kan-dokoro) on each line, which are indicated in the "Shamisen Bunka-Fu".
This rational system of music notation is not only simple or easy to understand but also it's appropriate for the musical instrument which has no fixed pitch like shamisen.

It is called "Bunka-Fu" or "Aka-Fu" (red text) as an abbreviated name.