Unknown is an adjective in English that means unknown.
The word unknown it is used to describe something that is beyond anyone's knowledge or understanding. It can indicate an unknown, something that is strange or unfamiliar.
In some senses, the word unknown refers to a lplace that has not been identified, explored or discovered. Ex: The explorer decided to go to the unknown part of the forest. / The explorer decided to go to the unknown part of the forest.
For unknown is an English expression meaning "for reasons unknown". Ex: For reasons unknown, the athlete decided to forfeit the competition. / For unknown reasons, the athlete decided to withdraw from the competition.
Known is the adjective in English that means "known" because it is formed from the verb know which means to know. So the word unknown is formed by the prefix un (which indicates the negation) + known.
In some cases, the word unknown it can be a noun, indicating a thing or person that is unknown. Ex: The Nobel prize was won by an unknown. / The Nobel Prize was won by an unknown person.
Unknown application or device
On cell phones, when an application is not recognized by the system, the message appears unknown application, which means unknown application. This can happen when the user tries to use a service that is not compatible with his cell phone, for example, trying to check the balance by entering the specific number of an operator different.
In the field of computing, when an operating system is in English and does not identify a pen drive, for example, it is common to receive the message "unknown device", which means "unknown device". Often, for the system to recognize the driver, it is necessary to download and install a specific driver on your computer.
Unknown soldier
The expression "unknown soldier" means "unknown soldier". There are several monuments built in honor of the unknown soldier, to honor the memory of soldiers who lost their lives in wars and whose names are unknown. This practice began after World War I.