The phrase does not appear to be a standard term, abbreviation, or widely recognized concept in major fields like aviation, law, medicine, or technology.

: Could you mean "Docum AVI" (referring to a video file documentation) or "Ducum" (Latin for "leader")?

To provide a helpful write-up, I need a little more context. It is possible this is:

: Is this part of a phrase in a language other than English?