noun
second year of high school; second-year high-school student
Abbreviation of 高校二年(生). Used in school contexts to refer to the grade or the student.
彼は高二で数学が得意だ。
He is in his second year of high school and is good at math.
高二の夏に留学した。
I studied abroad in the summer of my second year of high school.
Abbreviation of 高校二年 (second year of high school), formed by taking the first kanji of each word.