It's possible that this is a misspelling or a term specific to a very niche area.
Could you please provide more context? For example:
* Where did you encounter this term? (e.g., a book, a website, a conversation)
* What was the context surrounding the term? (e.g., a description of a technology, a mention of a specific function)
With more information, I can help you understand what "Kalantiaw Code" might refer to.