What is banlag in English term?

"Banlag" is not a standard English term. It's possible you're referring to a specific word or concept from another language.

To help me understand, could you provide more context? For example:

* Where did you encounter this word? (e.g., in a book, a conversation, online)

* What is the word used for? (e.g., a type of clothing, a food, a place)

* Do you have any other information about it? (e.g., a definition, a picture)

With more information, I can help you find the English translation or equivalent.