| Invalid |
A decision has been made that a previously valid register item contains a substantial error and is invalid, and will normally have been replaced by a corrected item. |
| Valid |
The item has been accepted, is recommended for use, and has not been superseded or retired. |
| Superseded |
The item has been superseded by another item and is no longer recommended for use. |
| Retired |
A decision has been made that the item is no longer recommended for use. It has not been superseded by another item. |
| Submitted |
The item has been entered into the register, but the control body has not accepted the proposal to add it. |