A zero technically has an infinite amount of lines of symmetry.
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the number 2 doesn't have and lines of symmetry
1
A regular octogon has 8 lines of symmetry. * * * * * An irregular octagon can have 0, 2 or 4.
The lower case k, as shown in the question, has 0 lines of symmetry.
I think that it can have 0, 1, 2, 3, 6, 9 or 18 lines of symmetry.