Graffiti
Graffiti has also long been seen as a gang-related activity, and its use is closely connected to the fact that many gangs have particular areas that they always try to control. As above, the graffiti is often highly symbolic and may contain more information about the gang's activities, values, and their current opponents.
Most often, gangs spray graffiti to mark territory or send a threat to a rival gang. When at war with another gang, they may visit locations the rival gang has already made their mark upon, crossing out the names of enemies they have killed, or simply covering up the rival. This is also known as a "cross out".
Read more about this topic: Gang Signal