The "Xi" carved on the stone is a symbol of China's traditional culture, representing the meaning of wishing the new couple happiness. In China's traditional culture, the wedding is an important event in life, so when people get married, they will stick an auspicious symbol "Xi" on the wedding banquet to seek the happiness of the new couple.

As for the specific area, age and building where the word "Xi" appears on the stone, it is even more difficult to determine. Because this symbol is very popular in the history of China, it can be found in buildings in various regions. Generally speaking, stone tablets, memorial archways, temples, gardens, mansions, official residences and other buildings may have carvings engraved with the word "Xi". If you have more specific clues, or you can search the internet for relevant information.