* A misspelling: Perhaps you meant a similar-sounding word like "Tishreen" (Arabic for October).
* A proper noun: It could be a person's name, a place name, or a brand name.
* A made-up word: It might be a term created for a specific context, like in a fictional story or a game.
To help me understand what you're looking for, please provide more context. For example:
* Where did you encounter this word? (e.g., in a book, online, in a conversation)
* What was the context? (e.g., what was the surrounding text or conversation about?)
* What language are you thinking of?
With more information, I can try to figure out the meaning of "Tisharna".