Sometimes it is symmetrical in form, but usually it is more or less irregular and unsymmetrical in form.
"Studies of American Fungi. Mushrooms, Edible, Poisonous, etc."
George Francis Atkinson
The plan of the Swedish building is unsymmetrical, but well balanced, nevertheless.
"The Art of the Exposition"
Eugen Neuhaus
It is a little difficult without the employment of mathematical analysis to explain precisely the manner in which earthing one side of the loop or making the loop unsymmetrical as regards inductance has the effect of creating overtones in it.
"Hertzian Wave Wireless Telegraphy"
John Ambrose Fleming