Numbers that have rotational symmetry are those that look the same after being rotated by certain angles. In the case of single-digit numbers, the numbers 0, 1, and 8 have rotational symmetry. When rotated 180 degrees, 0 and 8 look the same, and when rotated 90 degrees, 1 looks the same. Numbers like 2, 5, and 6 do not have rotational symmetry as they look different when rotated.
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9
for digits 0 to 9 0,1,3,8 have lines of symmtery
10
a nonagon
2, 4, 5, 6, 7 and 9. Also, in some fonts (such as in this one), 1, and less frequently 3.