The term '札勘' refers to a traditional Japanese method of counting money using bills, particularly in entertainment districts like geisha houses or high-end restaurants. It involves stacking bills in specific denominations and counting them rapidly with practiced hand movements.
This practice isn't just about mathematics—it's a performance art that demonstrates skill and professionalism. The rhythmic sound of bills being flicked and counted creates its own unique atmosphere in establishments where this method is still used. While modern cash registers have replaced it in most places, some traditional businesses maintain the custom as part of their cultural identity.