In the old days (decades past), the city of Hanoi has a famous nickname called "Ha Noi 36 Phố Phường" for its unique street naming convention. The word "phố phường" can be interpreted as block of street. Hence, "Ha Noi 36 Blocks". Each block of street has a name for a sole merchandise for sale. For example, the Flower Block sells only flowers, plant-related products, nothing else. The Wood Block would sell only wood-related products. The Steel Block would sell only metal-related products, the Silk Block, the Coffin Block, etc...