In human culture:
1. The international area code for Mozambique is 258.
2. American National Highway 258 is a branch of American National Highway 58.
3. It is the local mahjong-the "general" in Changsha Mahjong. Ping Hu needs a deck of cards, which must be 2, 5 and 8 for Hu. 258 will mean that the cards in the sum card must be 10000 cards, tubes and strips with 2, 5 and 8 card points. Strictly speaking, it is not a basic species, so software is used to treating it as one of the basic rules.
Extended data
In mahjong, 258 will not be able to form a single variety, but can only be combined with other varieties. 258 will be retained in the calculation process, other basic species will be deleted after calculation, and will not be used in the calculation of later species, while 258 will always be retained.
Xiao Hu must use 258 cards (20000, 2 barrels, 2 cards, 50000, 5 barrels, 5 cards, 80000 cards, 8 barrels, 8 cards), but Hu Da does not have this restriction, and any pair of cards can be used as one card. All the 258 Hu cards don't need to be engraved, and the single card in your hand counts. This is also called chaos.
Baidu Encyclopedia -258