Proper noun
Unknowns
(US) Those US military personnel who have died in service, usually in war, without proper burial.
Whoever thinks algebra is a trick in obtaining unknowns has thought it in vain. No attention should be paid to the fact that algebra and geometry are different in appearance. Algebras (jabbre and maqabeleh) are geometric facts which are proved by propositions five and six of Book two of Elements. Omar Khayyám
There are known knowns. These are things we know that we know. There are known unknowns. That is to say, there are things that we know we don't know. But there are also unknown unknowns. There are things we don't know we don't know. Donald Rumsfeld
The world is divided into two categories: failures and unknowns. Francis Picabia
At the end of the day, if you are in Aljunied, ask yourself: Do you want one MP, one Non-Constituency MP, one celebrity who has been away 30 years, and two unknowns to look after you? Or would you prefer me and my hand-picked colleagues? Lee Kuan Yew
Birth and death; we all move between these two unknowns. Bryant H. McGill
The interesting thing about Bettie Page that I discovered was to leave the mystery. She always retained a little mystery. Let there be some unknowns. Gretchen Mol