There are currently many different types of CAT 5. All of which can be found in the public domain. Obviously some are used more than others!
5 (PROV)
The aircraft is considered beyond economic repair.
5 (COMP)
The aircraft is beyond economic repair, or is surplus, but is recoverable for breakdown to components and spare parts.
5 (GI)
The aircraft is beyond economic repair, or is surplus, but is suitable for ground instructional use.
5 (SCRAP)
The aircraft is beyond economic repair, or is surplus, and is fit for scrap or disposal only.
5 (MISSING)
The aircraft is missing from a flight
Hope this helps.