meçhul
Meçhul is a Turkish word that translates to "unknown" or "anonymous" in English. It is often used to describe individuals or things whose identity or origin is not known. For example, a letter without a sender's name would be considered "meçhul bir mektup" (an unknown letter). Similarly, a person whose background is unclear might be referred to as "meçhul bir şahıs" (an unknown person).
The term can also be applied to abstract concepts. For instance, a mystery or an unsolved problem