Zero
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I think that it can have 0, 1, 2, 3, 6, 9 or 18 lines of symmetry.
8 has lines of symmetry.
9
Ah, a cuboid is a special shape with 9 lines of symmetry. Each face of the cuboid has a line of symmetry running through its center, and there are additional lines of symmetry that go through the midpoints of each pair of opposite edges. It's a beautiful thing to observe the symmetry in nature and mathematics.
9