This is the 307th most frequent Vietnamese word.
sàn
"Floor" or "platform."
In this sentence, "sàn" refers to the 'floor' of a building, specifically the ground inside a house. This usage is the most common.
Tôi lau sàn nhà mỗi sáng.
I mop the floor every morning.
Here, "sàn" refers to a figurative 'floor' or 'platform' where specific activities are conducted, in this case, stock trading.
Các cổ phiếu được giao dịch trên sàn giao dịch chứng khoán.
Stocks are traded on the stock exchange floor.
In this example, "sàn" is used to mean a physical platform constructed above the ground, often used for specific purposes.