The following has been excerpted from a 2008 article on The Guardian website.
Logos making use of circles in one form or another do seem to be among the most eye-catching and memorable; and most date from a period stretching from shortly before the first world war to the end of the second world war. Three, at least, just happen to come from Germany.
These are the VW logo, designed by Franz Reimspiess, a VW engineer;
The Mercedes-Benz logo, first seen on a German Daimler in 1909, but refined into the purist shape we know so well in 1937;
And the Audi logo, dating from 1932, its four overlapping circles representing that year’s merger of Audi, DKW, Horch and Wanderer.
The famous Olympic Games logo was designed in much the same vein; this was the work of a Frenchman, Pierre de Coubertin, and first appeared in 1913.
And no Metro company has yet to come up with a better, and longer lasting, logo than London Underground did more than 80 years ago. The Bullseye, slightly modified since to become the Roundel, consists of a horizontal bar set through a circle. It still looks good, and is instantly recognisable.
The circle is clearly a form humans find easy to remember and recognise.
Read the full article, In praise of the CND logo, on The Guardian.
Related: BMW logo evolution.