What does thia mean rod is the logic of

Please provide more context. "Thia" is not a word in English, and "rod" could refer to many things (a stick, a part of a fishing pole, a measuring stick, etc.).

To understand what "thia" and "rod" mean in this context, please provide the full sentence or phrase where you encountered these words.

For example, is it a sentence like:

* "The thia rod is the logic of..."

* "The logic of thia rod is..."

Once I have more context, I can help you understand the meaning.