A gang burn using a quarter placed mostly on a part of the arm. The burn leaves an imprint of the picture on the quarter. It's used for many reasons in many gangs. In some a member will receive burns from smaller peices of change to signify accomplishments and work up to a quarter. It's often done with change from the gang's country.
As a quarter burn, a certain Chicago based gang uses the american 50 cent peice to show the member is an OG.