YinYang[size_] :=
 Graphics[{{Circle[{0, 0}, 2]}, {Disk[{0, 0},
     2, {90 Degree, -90 Degree}]}, {White, Disk[{0, 1}, 1]}, {Black,
    Disk[{0, -1}, 1]}, {Black, Disk[{0, 1}, 1/4]}, {White,
    Disk[{0, -1}, 1/4]}}, ImageSize -> 40 size]