* A misspelling: Perhaps you meant "tricycle", a three-wheeled vehicle.
* A technical term: It could be a technical term in a specific field (like chemistry or engineering), but without context, it's impossible to say for sure.
* A made-up word: It's possible that "trical" is a word invented by someone, perhaps in a specific context like a fictional story or game.
Could you please provide more context or information about where you encountered the word "trical"? Knowing the source or context will help me understand its meaning.