The 'walk/travel' radical. The modern wrap-around form of 辵 (chuò). One of the highest-yield reading shortcuts in Chinese — almost any character containing 辶 relates to motion, travel, or path: 进, 退, 还, 过, 远, 近, 道, 通, 连, 迎, 送, 追, 逃, 逛, 遇. Always sits at the bottom-left, sweeping under the rest of the character.