Let's count to 1 million

The name Yakuza meaning Japanese gangsters comes from "893" (yattsu, ku, san). This name originates from a card game called oichokabu (おいちょかぶ), which is usually played with a deck of hanafuda (花札) "flower cards". A player's score in this game is decided by adding the scores on several cards and using only the smallest digit. Because 8 + 9 + 3 = 20 = 0 points, "8-9-3" means "no points". So the original meaning of yakuza (ya for yattsu, eight, ku for "nine" and za for san, "three" was "no points" or "useless". Later, this meaning changed to "useless people" or "gambling people".

https://www.sljfaq.org/afaq/yakuza.html
https://www.britannica.com/topic/yakuza