信笔

信笔	xìn bǐ	to write freely / to express oneself as one pleases
信	xìn	letter / mail / CL:封 / to trust / to believe / to profess faith in / truthful / confidence / trust / at will / at random
笔	bǐ	pen / pencil / writing brush / to write or compose / the strokes of Chinese characters / classifier for sums of money, deals / CL:支,枝