How many cards are there in a deck? why

A deck of 54 cards, including two ghost cards and 52 suit cards. There are four kinds of suit cards, each of which consists of an A23 card ... JQK 13 card.

As for the reason, opinions vary, and opinions vary from place to place. Generally speaking, it is related to the whole astrological divination and the laws of nature. Another possibility is that poker was originally used as astrology.

The following explanation comes from Baidu Encyclopedia.

China people understand the four colors as spring, summer, autumn and winter.

The French understand the four colors as spear, square, clove leaf and red heart;

Germans understand the four colors as leaves, bells, acorns and hearts.

Italians understand the four colors as swords, coins, crutches and wine glasses;

The Swiss understand the four colors as acorns, bells, flowers and shields;

The British understand the four colors as shovel, diamond, clover and red heart.

The 54 patterns of playing cards are also wonderful to explain:

GREAT GHOST represents the sun, Kidd represents the moon, and the remaining 52 cards represent 52 weeks of the year.

Heart-shaped, diamond, plum blossom and spades symbolize spring, summer, autumn and winter respectively.

There are 13 cards in each suit, which means there are 13 weeks in each season.