笔心 Traditional form: 筆心 Pinyin (reading): bǐxīn Definitions: pencil lead refill (for a ball-point pen) Characters: 笔 - pen, pencil, writing brush; to compose, to write; Hanzi stroke 心 - heart; mind; soul Traditional characters: 筆 - pen, pencil, writing brush; to compose, to write; Hanzi stroke 心 - heart; mind; soul