0, 1, and 8 have symmetry. (:
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I have revised this answer. This question is harder than it looks!The numbers 69, 6009 or 98886, for example, would have rotational symmetry (looks the same when rotated by 180 degrees) but not reflection symmetry.So I think the answer is going to be something like:A number which consists of the digits 6 and 9 plus or minus the digits 0 & 8 AND has the digits in the necessary order to maintain rotational symmetry.
the numbers tht do not have line of symmetry are f ,g,j,l,n,p,q,r,s,,x,z.
zero, all the keys have different letters, numbers, or symbols
0 if it is irregular, 8 if it is regular. Probably some numbers in between are possible, too.