The Federal Aviation Administration (FAA) shares the Environmental Protection Agency's (EPA) concerns about lead emissions from small aircraft. Owners and operators of more than 200,000 piston-engine aircraft operating in the United States rely on aviation gasoline (avgas) to power their aircraft.
Symmetry (noun). a due proportion of the several parts of a body to each other; adaptation of the form or dimensions of the several parts of a thing to each other; the union and conformity of the members of a work to the whole. Symmetry (noun).
Symmetry creates a pleasing balance, where one side of the image matches the other. Reversal of the shape is 'the same but not the same' and so creates both harmony and tension. More generally, symmetry is a form of order, which helps to make us feel good at discovering regular patterns.hen we see symmetry, we assume there is some connection between the two parts. We may also assume that each of the two parts is a coherent whole. In symmetry, shapes have an axis (the 'axis of symmetry'), either side of which is a mirror-image of the other.