kunrei-shiki romanization; kunrei system
The official Japanese romanization system based on phonology, as opposed to Hepburn romanization. Used in government documents and education.
See also: ヘボン式ローマ字
In kunrei-shiki romanization, 'し' is written as 'si'.
Hepburn romanization is used for passports, but kunrei-shiki romanization is sometimes taught in schools.