大三元. It's a Mahjong reference.[0] By the way, those are the 17th, 125th and 370th most common characters in modern written Chinese. 0. https://zh.m.wikipedia.

大三元. It's a Mahjong reference.[0] By the way, those are the 17th, 125th and 370th most common characters in modern written Chinese. 0. https://zh.m.wikipedia.org/zh/%E5%A4%A7%E4%B8%89%E5%85%83 https://zh.m.wikipedia.org/zh/%E5%A4%A7%E4%B8%89%E5%85%83