What do the statuses "RETRO" and "binding started" mean?

The RETRO status is used in our library for documents that have only been partially transcribed into the online catalogue and do not yet have a barcode. You can order these documents, but before they are loaned to you, the code will be affixed and a decision will be made as to whether the document can be loaned to your home or only to the study room.
A "binding started" status means that the unit is in the bindery, where things like repairing loose bindings or binding periodicals into larger units occur. Units are usually in this status for 14 days.