Having entered, for example, the toilet of the hostel of any vocational school, any school, you will see comprehensive information about "who is who": Kolya Vetrov - "plebeian," Tolya Semenov - "bull," Seryozha Kruglov - "kid," etc. I think readers saw these and other "masterpieces" of wall and "nasaborny" printing or tattooing of children, heard them address each other not by name, but by nicknames, speak to each other in their own "language." In this book you will find: vows in criminal groups, nicknames, decoding tattoos and much more.