The word "逆光" is formed by combining the character "逆", meaning "against" or "contrary", which is composed of the radical "辶" denoting movement and the component "屰" conveying opposition, with the character "光", meaning "light", consisting of "儿" representing a person and "火" symbolizing fire or brightness; together they literally mean "against the light", referring to backlighting where light comes from behind the subject.