# Korea Exchange - Derivatives Enumerations

The Korea Exchange (KRX) Derivatives Market offers trading in futures and options on equities, indices, interest rates, commodities, and currencies.

The following fields have Enumerations:

* BOOK_TYPE - Type of order book or trading mechanism through which a trade was executed.
* TRADE_PERIOD - Market period during which a trade was executed.
* TRADE_TYPE - Type of trade

#### BOOK_TYPE - Enumeration

|   Enumeration ID | Enumeration Description   |
|------------------|---------------------------|
|                0 | Lit order book            |
|                1 | Off-book                  |

#### TRADE_PERIOD - Enumeration

| Enumeration ID   | Enumeration Description   |
|------------------|---------------------------|
| -                | Regular trading           |
| C                | Closing auction           |
| O                | Opening auction           |
| U                | Unscheduled auction       |

#### TRADE_TYPE - Enumeration

|   Enumeration ID | Enumeration Description   |
|------------------|---------------------------|
|               10 | Opening auction           |
|               11 | Delayed opening           |
|               20 | Auction                   |
|               30 | Closing auction           |
|               40 | Continuous trading        |
|               46 | Negotiated trade          |
|               50 | Volatility auction        |
|               51 | Delayed re-opening        |