What is the significance of J Q K in poker?

J, Q and K*** in playing cards have twelve cards, which not only represent the twelve months in a year, but also represent the twelve constellations that the sun passes through in a year.

J, Q and K in French playing cards are abbreviations for English attendants, queens and kings. At present, we often see that the top card of 12 represents a real person or a legend in history.