What do you call nano4?
"Nano4" typically refers to a class of nanomaterials or a specific formulation within nanotechnology, but its meaning can vary depending on the context. In some cases, it may refer to a type of carbon nanomaterial or a specific product name in industries like electronics or pharmaceuticals. Without additional context, it's challenging to pinpoint an exact definition. If you have a specific field or application in mind, please provide more details for a clearer answer.