[计] quarter square multiplier, quarter-square operator

sì fēn zhī yī píng fāng chéng fǎ qì ㄙˋ ㄈㄣ ㄓ ㄧ ㄆㄧㄥˊ ㄈㄤ ㄔㄥˊ ㄈㄚˇ ㄑㄧˋ