The outline of the symbol is defined as the universe (Lok). The lower part of the symbol represents the seven hells (Naraki). The middle part of the universe contains the Earth and the planets (Manushyalok). The upper part contains the heavenly abodes (Devlok) of all the celestial beings and abode of the Siddhas (Siddhashila).
The raised hand means stop. The word in the center of the wheel is "Ahimsa". Ahimsa means non-violence.
The four arms of the swastika remind us that during the cycles of birth and death we may be born into any one of the four destinies: heavenly beings, human beings, animal beings, (including birds, bugs, and plants) and hellish beings.
The three dots above the swastika represent the three jewels of Jainism: Samyak Darshan (Right Faith), Samyak Jnan (Right Knowledge), and Samyak Charitra (Right Conduct).
At the very top part of the Jain Universe symbol is a small curved arc. This arc represents the abode of the Siddhas. It is known as the Siddhashila. It is the final resting place of the liberated souls. The dot represents a siddha. In order to achieve this stage, a soul must destroy all attached karmas.