> For the complete documentation index, see [llms.txt](https://guide.ssi.com.vn/ssi-products/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://guide.ssi.com.vn/ssi-products/fastconnect-data/data-mapping/trading-session.md).

# Trading session

Trading session includes:

* ATO: Opening Call Auction, applicable for HOSE, DER
* LO: Continuous Trading 
* ATC: Closing All Auction, applicable for HOSE, HNX, DER
* PT: Put-through 
* C: Market Close 
* BREAK: Lunch Break 
* HALT: Market Halt