(bound form) lens; an optical tool used to correct vision, take photographs, or perform experiments

(bound form) mirror; an object used to reflect an image, often made of glass with a metallic backing

(literary) to reflect an image in water or a mirror; to look into a mirror

(literary) to examine oneself; to learn from a past event or use something as a reference for warning or insight

(literary) clear; bright; pure; clean

a Chinese surname