What does a common name or sign signify in a criminal gang?

In the context of criminal gangs, a common name or sign typically signifies the identification of shared goals or identity among members. This name or symbol becomes a crucial element of the gang's culture and unity, allowing members to recognize each other and affirm their allegiance to the group. It acts as a powerful marker of belonging, encapsulating the gang's values, territorial claims, or the criminal activities with which it is associated. This element of identity is essential to the cohesion of gang members, fostering a sense of loyalty and purpose within the group.

The other options provided do not accurately reflect the primary meaning of a common name or sign in this context. They either imply formal recognition or relationships that do not exist within the framework of criminal gangs.