Mao Collection, Upper Volume Radical: Heart (xīn) Character: 懝 Kangxi Strokes: 18 Page 406, Entry 35 Pronounced ai (falling tone). As defined in the Discussion of Writing (Shuowen Jiezi), it means to be frightened. Another definition is to be apprehensive. Sometimes also written in a variant form. Also, pronounced ni (falling tone). It means to estimate or measure. Originally written as a character meaning to estimate (nǐ), sometimes written with the heart radical. Also, pronounced yi (falling tone). As defined in the Discussion of Writing (Shuowen Jiezi), it refers to a young child possessing knowledge or awareness. Originally written as a different character, sometimes written with the heart radical.