The word "闪烁" is formed from two characters: "闪" combines the radical "门" (door) with "人" (person) to depict a person moving quickly through a doorway, conveying the idea of a sudden flash or shine; "烁" uses the radical "火" (fire) to indicate meaning related to light or heat, with the component "乐" primarily serving as a phonetic element to suggest pronunciation. Together, these characters semantically reinforce each other to represent the concept of flickering or twinkling light.