单眼

ommatidium (single component of insect's compound eye) / one eye (i.e. one's left or right eye)

surname Shan

bill / list / form / single / only / sole / odd number / CL:個|个[ge4]

eye / small hole / crux (of a matter) / CL:隻|只[zhi1],雙|双[shuang1] / classifier for big hollow things (wells, stoves, pots etc)