The word "瞬间" is formed by combining the character "瞬", which means "blink" and is composed of the radical "目" (eye) indicating its relation to sight and the component "舜" suggesting its pronunciation, with the character "间", which means "interval" and is composed of "门" (door) and "日" (sun) to imply a gap or space. Together, they literally denote "the interval of a blink", conveying the meaning of an extremely brief moment.