Where the shape comes from
A pig seen from the side, snout, round belly and short legs all drawn along its back, the curled tail marking the rear. Kept under a roof, it gives 家, home, family, the old picture of a household built around the livestock penned beneath the same roof as the people; chased by a foot, it gives 逐, to pursue, to expel.
汉字 filed under 豕
No published character on HSK Guide is filed under this radical yet. 汉字库.