What do you call vasthu in English?

"Vastu" itself is a Sanskrit word and doesn't have a direct equivalent in English. However, depending on the context, you could use phrases like:

* Vastu Shastra: This directly translates to "science of architecture" and is commonly used to refer to the whole system.

* Vastu principles: This refers to the specific guidelines and principles of the system.

* Vastu design: This emphasizes the architectural and design aspects of the system.

* Vastu-compliant: This describes a structure or space that follows Vastu principles.

* Ancient Indian architecture: This is a broader term that encompasses Vastu and other traditional architectural styles.

Ultimately, the best English equivalent depends on the specific context and what you are trying to convey.