prefix
nth year of Heisei
Abbreviation of 平成, used as a prefix before a year number to indicate a year in the Heisei era (1989–2019).
See also: 平成
平30年は2018年です。
Heisei 30 corresponds to 2018.
この書類には「平15」と書いてある。
This document says 'Heisei 15'.
平成 is the full era name; 平 is its abbreviated prefix form used before year numbers.
Abbreviation of 平成 (Heisei), the Japanese era name from 1989 to 2019.