光笔

光笔	guāng bǐ	light pen
光	guāng	light; ray (CL:道) / bright; shiny / only; merely / used up; finished / to leave (a part of the body) uncovered
笔	bǐ	pen / pencil / writing brush / to write or compose / the strokes of Chinese characters / classifier for sums of money, deals / CL:支,枝