The highest rank in Cub Scouting is the Arrow of Light. Earning this rank prepares a Cub Scout to become a Scout. Scouts must complete six required adventures and two elective adventures to earn the Arrow of Light rank. For each adventure a Webelos completes, they receive a pin to wear on the Adventures colors or on their hat.
The Arrow of Light badge is the only Cub Scout badge that can be worn on the Scouts BSA uniform when a child graduates into a troop. Adult leaders who earned the Arrow of Light rank when they were young may also show their achievement by wearing a special square knot on their adult uniform.
This link will take you to the requirements and descriptions for the Arrow of Light.