Type of auction order.
| Code | Meaning |
|---|---|
| 0 | None |
| 1 | Block order auction |
| 2 | Directed order auction |
| 3 | Exposure order auction |
| 4 | Flash order auction |
| 5 | Facilitation order auction |
| 6 | Solicitation order auction |
| 7 | Price improvement mechanism (PIM) |
| 8 | Directed Order price improvement mechanism (PIM) |