ヤクザという言葉の由来はなに
The name "Yakuza" originates from the traditional Japanese card game Oicho-Kabu, a game in which the goal is to draw three cards adding up to a value of 9. If the sum of a hand exceeds 10, the second digit is used as the total instead, with the exception of 10 (which equals 1). If the three cards drawn are 8-9-3 (pronounced ya-ku-sa in Japanese), the score is 20 and therefore zero, making it the worst possible hand that can be drawn.
traditional Japanese card game Oicho-Kabu