What does the plum blossom 7 stand for?

Represents a playing card of plum blossom suit, with 7 points.

In the traditional poker game in China, Club 7 is a specific playing card. Each deck of playing cards includes four suits: spades, hearts, diamonds and clubs. Each suit has 13 cards, and the points from A to K are different. Club 7 represents the playing cards belonging to the suit of clubs, and the points are 7. In the rules of the game, different points and combinations will correspond to different ways of playing or scoring.