The Puppet Symbol is a symbol representing the puppet. It resembles a lowercase "b" with a line through the circle. It is part of the Puppet shrine. Ironically, The Puppet does not get effected by the shrine. The Puppeteers group members do only. In Transmission 2, Needles seems to be building it and is not effected. This means that, Needles is the only person that doesn't get effected. Apparently, the rest of the group does.
The shrine was proven to be built by Aurora to clear away the gang. The reason why Needles and Puppet don't get effected is because, Needles is not in the gang yet. She is the most recent member to join. Besides Jake.