unk-unk
n.— «Many unknowns are evident at the beginning, and may be called “known unknowns.” These are identified early as potential problem areas and are therefore singled out for examination and resolution.…However, many other problem areas are only identified later when they are discovered during system development. These unanticipated problems are often identified as “unknown unknowns” are “unk-unks” to distinguish them from the group of “known unknowns” that were recognized at the outset and dealt with.» —by Alexander Kossiakoff Systems Engineering Nov. 15, 2002. (source: Double-Tongued Dictionary)
Further reading
In the 15th century, the word respair meant “to have hope again.” Although this word fell out of use, it’s among dozens collected in a new book of soothing vocabulary for troubled times. Plus, baseball slang: If a batter...
There was a time when William Shakespeare was just another little seven-year-old in school. Classes in his day were demanding — and all in Latin. A new book argues that this rigorous curriculum actually nurtured the creativity that later flourished...