multifoil

As nouns the difference between outline and multifoil

is that outline is a line marking the boundary of an object figure while multifoil is (architecture) a symmetrical shape which forms the overall outline of a set of partially-overlapping circles of the same diameter.

As a verb outline

is (lb) to draw an outline of something.

As an adjective symmetrical

is exhibiting symmetry; having harmonious or proportionate arrangement of parts; having corresponding parts or relations.

As a noun multifoil is

a symmetrical shape which forms the overall outline of a set of partially-overlapping circles of the same diameter.