What the Rotary Wheel Represents
The Rotary wheels has been a symbol since 1922.  It represents “Civilization and Movement”, in 1923 the gear wheel was introduced with 24 cogs and six spokes, however a group of engineers advised that this would be mechanically unsound and would not work without a “keyway” in the center to attach it to a power shaft.  Therefore, in 1923 the design was formally adopted as the Rotary International emblem.